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Crosman 2400KT CO2 Air Rifle – Part 11

# Crosman 2400KT CO2 Air Rifle – Part 11

by Tom Gaylord
Writing as B.B. Pelletier

This is Part 11 of the Hiveseeker guest blog. I had to break this report into two parts, the first of which ran yesterday. Today is a continuation of that report.

If you’d like to write a guest post for this blog, please email me. Now, over to you, Hiveseeker.

Crosman 2400KT CO2 Air Rifle – Part 11
The great Crosman 2400KT barrel shootout
By Hiveseeker

This report covers:

• By the numbers
• Choking hazard
• The last word

### By the numbers

We already discussed the 24 inch barrel, so now we are ready to dive into some numbers! I’ve summarized this data in the table below. This split table is slightly redundant. First, I want to show you the velocity increase compared to the shortest 7.5 inch baseline barrel. As we mentioned before, the average velocity increased by a total of 153 f.p.s. from the 7.5 inch barrel up to the 24 inch barrel, a difference in length of 16.5 inches.

The second part of this table shows the velocity increase compared to the previous barrel length. In other words, this is what you can expect in velocity gains if you swap your existing barrel for one of the longer barrels. The increase is additive — if you’re jumping from a 10.1 inch barrel up to an 18 inch barrel then your total velocity increase should be about 43 f.p.s. (that’s 28 f.p.s. increase for going from 10.1 to 14.6-inches and another 15 f.p.s. for going from 14.6 to 18-inches).

In this part of the table you can also see that the 7.5 inch barrel increases the velocity spread at the low end by a negative 51 f.p.s. (it decreases the overall velocity by that amount), and the 24 inch barrel adds 59 f.p.s. at the high end. As we discussed earlier, these two extreme barrels account for a full two-thirds of the total velocity spread.

This next table is also slightly repetitive, but specifically addresses a topic that I found to be widely discussed in the modding forums: Velocity increase per inch of barrel length increase. As you can see in the orange column on the table below, this varies. However, except for the increase from the 7.5 inch barrel that was 20 fps per inch — the increase varied between only 9 and 11 f.p.s. per inch. The number I saw mentioned most in these forum discussions was a velocity increase of about 10 f.p.s. per inch of barrel length increase, and, except for the 7.5 inch barrel, that is entirely correct.

The last column above simply shows velocity per inch of barrel length. This entire blog has shown us that velocity increases with barrel length in a CO2 gun, but you can see here that the amount of velocity gain dwindles steadily as the barrel grows longer. This is due to increasing friction on the pellet as it passes through longer and longer barrels. The graph of this data (below) shows a consistent — but decreasing — velocity gain as barrel length increases.

Although we already know that velocity increases with longer barrels, the amount of this increase declines with barrel length, as you can see by the downward sloping line. The longer the barrel, the lower the velocity per inch. Friction on the pellet begins to overcome the advantage provided by a longer barrel.

So, if the velocity gain declines as the barrel gets longer, how fast and how far can you go? The graph below plots our simplest data from the tables above — the average velocity for each barrel length. A polynomial line-of-best-fit projection of this data shows that velocity will theoretically increase until it reaches 725 f.p.s. at a barrel length of 57 inches, marked by the arrow. At this point barrel friction on the pellet overcomes the velocity increase provided by a longer barrel, and velocity actually begins to decline.

A theoretical projection of our data shows that velocity should increase until it reaches 725 f.p.s. at a barrel length of 57 inches (arrow). I’ve provided the equation for those that like math more than I do! The correlation (R2) of 0.9623 approaches a perfect 1.0, showing a very consistent relationship between barrel length and velocity.

[Editor’s note: You won’t find any barrel maker who will or even can rifle a 57-inch barrel today. While it is still possible to do, 150 years ago when barrels were made by hand and rifling machines were constructed with long barrels in mind, it was even more possible. There simply is no demand for rifle barrels that long today. Modern rifling machines are designed to accommodate barrels of certain lengths and no longer. The longest barrels you will easily find today will be around 29-30 inches. That doesn’t include black powder barrels, but their twist rates are often very slow.]

I wanted to complete this data package with a full shot string reference table that I hope modders and other shooters will find useful. Note that I had stopped each test when velocity dropped below 400 f.p.s., where I found that accuracy fell off. For that reason, the 31-40 shot strings in the table below do not report a 10-shot average, but list the number of shots in that string and the minimum and maximum velocity I got when each barrel dropped below 400 fps. For example, the 10.1 inch barrel only had 3 shots in that string, ranging from 384 to 417 f.p.s. (Of course, 384 f.p.s. was the last shot.) I felt that this would be more accurate than reporting an incomplete average that did not include a full 10 shots.

*Note that the HiveSeeker II with 18 inch barrel exhibited a slow velocity increase, resulting in the second 10-shot string actually being slightly faster than the first.

### Choking hazard

I still have one final comparison to complete! In one of my earlier blogs, fellow reader Buldawg76 suggested that the choked Lothar Walther barrels reduce velocity. The Lothar Walther barrels are also noticeably tighter than the Crosman barrels at the breech end too; you can tell by the additional resistance when closing the bolt and seating a pellet. We had already chronographed a choked 14.6 inch Lothar Walther barrel on my HiveSeeker II at 522 f.p.s. in Part 9. Today, you saw that the Crosman 14.6 inch barrel produced 543 f.p.s. This is a difference of 21 fps or 4%, and I would expect a similar relationship between Lothar Walther and Crosman barrels of other lengths. I consider this to be a small price to pay for the accuracy gain that I’ve experienced with my Lothar Walther barrels, but the velocity difference is one to be aware of as you configure or mod your Crosman CO2 guns.

The 14.6 inch Crosman barrel produced a velocity of 543 f.p.s., compared to the tighter choked Lothar Walther barrel which produced 522 f.p.s.. This is a difference of 21 f.p.s. or 4%.

### The last word

The bottom line for this blog is that I discovered barrel length can make a much bigger difference in CO2 velocity than I had imagined: Up to 153 f.p.s. if you include the very short and very long barrels I tested. Combined with the Custom Shop power valve — which can add an additional 90 f.p.s. — it’s easy to see how my 2400KT in .22 was shooting just as fast as my 2400KT in .177. It’s taken some experimentation and time to fully answer that question, but I think we’ve learned a lot along the way! We’ve thrown a lot of numbers around yesterday and today, but don’t forget that the ultimate goal in understanding more about a gun is to better appreciate and enjoy it — to have fun!

What’s left? Well, in my final blog installment I finally break down and try a little modding! Don’t expect a full discourse on what can be done with the amazing Crosman CO2 guns, but I’ll be giving a brief introduction to most of the basic mods for these guns and what results I got when I tried them. See you in Part 12!

Tom Gaylord (B.B. Pelletier)
Tom Gaylord, also known as B.B. Pelletier, provides expert insights to airgunners all over the world on behalf of Pyramyd AIR. He has earned the title The Godfather of Airguns™ for his contributions to the industry, spending many years with AirForce Airguns and starting magazines dedicated to the sport such as Airgun Illustrated.
Categories Education / Training, Maintenance

### 74 thoughts on “Crosman 2400KT CO2 Air Rifle – Part 11”

1. Hiveseeker,

This will undoubtedly be a reference point for those modding their CO2 powered airguns. Thank you again for the heard work and time you have given to this project.

Siraniko

• Siraniko,

More than welcome, and thank YOU. This has been a great and supportive community to write for!

2. Hiveseeker,

Most excellent! No such thing as too much data. Your hard work has provided an excellent data base. Looking forwards to the final report on modding basics 101. Chris

• Hi Chris USA,

Thanks! Hope this will help other shooters. The modding article will be interesting — I’m finished with testing, now just photographing and writing.

3. Hiveseeker
So what’s your favorite barrel then.

And I know you ain’t into the next part of your tests (part12). But what are you looking for out of your gun when you mod it? Velocity, accuracy, small fps spread, shot count, fit and function, sighting, ease of sighting, weight of the gun, how good the gun looks, a better hunting gun?

Just wondering. Usually when I mod my guns I have a game plan of what I’m after. And again I know you ain’t at that part of your report yet. But I guess you gave it some thought didn’t you?

• Hi Gunfun1,

That’s a great question! After all the barrels I’ve tried, I’d have to say the 14.6″ Lothar Walther in .22 is my fave. I ordered a 2400KT with that barrel within days of its availability. It’s a good balance between great accuracy and providing some extra velocity. My second favorite would be the 18″ Crosman barrel which provides even more velocity. I have read of some Crosman barrels being as accurate as the LW barrels, and if I were to “get lucky” I would want it to be with an 18″ Crosman — good but not great accuracy in that barrel was my only disappointment with it.

The answer to your second question actually ties in with your first for me — I’m lookin’ for speed when I mod! I prefer .22 over .177, and for those heavier pellets my experience is that you need a certain amount of velocity to sustain accuracy out to 20 yards or more. So I guess I’m looking for accuracy too, but velocity is one way to get there. I do care about how my guns look, too, and being able to add a bit of bling in the Custom Shop is nice. My favorite “looks” are the gold muzzle brake and trigger shoe with black shoulder stock, and black muzzle brake and trigger shoe with the simulated carbon fiber shoulder stock.

• Had an added thought: If I get yet another 2400KT, it will probably be with a 24 inch barrel that I will leave in place. I really liked the velocity on that with no mods needed, and of all my 2400KTs that was the only one that hit and even exceeded the minimum 12 foot-pounds recommended for hunting.

• Hiveseeker
I’m thinking that 24″ barrel with the higher flow valve would be a good candidate for a HPA conversion.

What I would like to see for these Co2 pistols would be a adapter that could be added to put a regulated screw on HPA bottle on it like the Air Venturi bottle I have on my QB79.

If I could find that adapter I would for sure be getting me one of these 24″ equiped guns. Matter of fact yesterday and today Crosman has the custom shop guns on sale for 20% off. That’s a heck of a deal if you ask me for a already cheap gun. They even have the regulated Marauder rifle in .177 and .22 caliber now in the custom shop.

4. Hiveseeker,

Very interesting, really one of those blogs which will become a standard over time. Hat off!

Interesting is that you established that for airguns polishing the barrel may be a way to gain velocity. I would not recommend that doing in home, that would surely destroy a barrel. Even a little widening up of the bore can change accuracy as you suggested with the Lothar versus Crossmann barrel.

What is the amount of CO2 which is released per shot? Knowing that would be a way to approximate your velocity versus barrel length graph via another computation.

On the flippant side: What we really need is Teflon coated barrels!

Regard,

August

• Thanks, August.

Definitely all the data suggests that reducing friction would be a way to increase velocity. However, I think the increase would be relatively small from what I saw comparing the much tighter 14.6 inch Lothar Walther barrel to the Crosman barrel, in that case about 20 fps. However, with a longer barrel like the 24 inch the resulting velocity increase would be more significant. However, reduce friction on the pellet too much and the resulting looseness reduces accuracy. As with a lot of ballistics, it’s a balance.

I don’t know how much CO2 is released with each shot. I think it would be a fairly easy calculation based on the weight of CO2 in the cartridge (12 grams) and the assumption that velocity begins dropping at the point that all the liquid CO2 has been exhausted and the remaining CO2 is in a geseous state. Practically, I think the real question is what velocity are you getting and how many shots above a minimum velocity you’re getting. I found that velocity dropped like a rock below 400 fps.

I have a blowgun with a Teflon-coated barrel but haven’t velocity compared it — the general consensus in the blowgun community is that the velocity increase is not significant.

5. Hiveseeker,

What I find most interesting about this part of your report is the theoretical maximum barrel length. Perhaps you should collaborate with BB and calculate the maximum barrel lengths for his Talon SS and Edge using the data he collected from swapping different length barrels in these PCP air rifles. It will be really interesting to see if whether the maximum barrel length will be dependent upon power sources and power levels.

• Hi RidgeRunner,

Well — thanks for finding that interesting! I actually spent a bit of time fiddling with line-of-best-fit equations to get that, while consulting my mathematically inclined wife! Just a side note is that since the equation is based off measured data, which comes from barrels that are applying friction, it actually takes friction into account. I think it probably comes very close to what we would find if we actually had a 57 inch barrel. I think we could try to calculate a similar projection for B.B.’s guns, though as his editorial comment noted this would be a purely theoretical exercise.

• HiveSeeker,

Only to a point is it a theoretical exercise. There is one barrel manufacturer that makes barrels 36″ or longer with any caliber and rifling twist. You do pay a premium when you go over 36″, but you can get what you want. I myself would like to have an open lock rifle in .357 with a 42″ barrel.

6. Hiveseeker

Your table work will serve as a reference for years. Congratulations to you! Accuracy, not energy, happens to be my objective only because I can hunt with firearms. Two things really caught my eye. Spreads between minimum and maximum speeds are decidedly better for the first two 10 shot groups. One would expect some vertical stringing after that. The other is the 18″ barrel speed variation. I suspect that barrel is flawed and not representitive of 18″ Crosman barrels.

I have 14.6″ Lothar Walther barrels in my 2400KT and 1300KT. I can only surmise the same pattern applies.

Decksniper

• Hi Decksniper,

Thank you, and I included additional barrels in the middle of the size range for that purpose. I do hope it will be helpful to fellow shooters and modders.

For pretty much all the barrels, velocity began to drop around shot 25, so velocity spread was tighter for shot strings 1-10 and 11-20. If you REALLY need consistency or are going to extreme ranges, you would have to swap CO2 every 25 shots — a lot of dry firing. That’s the “cost” of the Crosman power valve: You are trading velocity for about half the shots per fill. I’m sure that’s why the power valve only comes on certain guns with longer barrels, 18 inch and 24 inch from my own purchases.

I don’t think the velocity variation in my 18 inch barrel gun is due to the barrel. I think it’s the valve. My wife’s 2400KT with .177 10.1 inch Lothar Walther barrel showed the same thing (see graphic), with the second string averaging faster than the first. On a side note, from my reading the 18 inch Crosman barrels seem to have the widest variation in accuracy, with some being much less accurate than others.

• HS,

That suggests that a conversion to bulk fill might be something to think about.

B.B.

• Hi B.B.,

My first comment today should have been to thank you for a great job piecing these two blogs together! Really appreciate all your work to make this happen.

I must confess that bulk fill will be one of the few mods I’ll be discussing in Part 12 that I did not actually try. However, your 2240 conversion to air did a good job covering that and I’ll be referring to it. There are actually a number of different options out there now and I must say they look much easier than it used to be.

7. HS,

Now you need a FULL report on the loudness of each barrel.LOL.
Seems the “perfect” length barrel would be 16″, yet there is none….
Thanks for all the work.

-Yogi

• Hi Yogi,

Some of those shorter barrels were indeed loud! Fortunately I’m in a suburban area where noise doesn’t seem to be much of an issue. The longer barrels are definitely quieter, and the ported Crosman muzzle brake on this particular gun actually seemed to help a little (not all the Custom Shop muzzle brakes have porting). However, this test has made me appreciate my shrouded PCP guns even more!

8. Hiveseeker

I should not have mentioned the 1300KT because obviously it is a multipump.

Decksniper

• Hi again Decksniper,

Actually, your 1300KT mention is MUCH more appropriate than you are thinking. Although CO2 is a different gas than the 78% Nitrogen and 21%Oxygen you pump your pneumatic up with, velocity increases with barrel length in those guns too. I would not expect the exact same relationship we are seeing here, but I think it would be similar with the percentage increase from barrel to barrel being proportional if not actually the same percentage.

Also, the 1377/1322 guns share a number of parts with the 2240/2400KT, and ALL of these are fan favorites for modding. A number of the possible mods will work on both guns. Most of the modding forums I browse cover all of them.

9. After part 12 you could start over with a study of the Crosman custom pump carbine and barrel lengths. Also if the valve of a long barreled co2 rifle remained open a fraction longer, then the co2 pressure in the barrel would be higher and velosity hifher as well. (Correct ?)
Thanks for a good series. Now put it in book form.

• Hi Bill,

Whooo, I’m thinkin’ how much more work that would be! It would be interesting but I don’t think I’ll be going there. One of the things that led me to the 2400KT was not wanting to pump any more — I have owned a Crosman 1377, a 760, a 2100 and an MK-177 and am tired of pumping! (I’m not gettin’ any younger, either . . .)

You are absolutely correct about the CO2 valve providing more velocity if it stays open even a fraction of a second longer. We’ll be looking at that — stay tuned for some modding in Part 12!

10. HiveSeeker,

Another great installment ! I was under the impression that this was the finale but I’m thrilled that there will be at least one more. Maybe you’ll inspire another reader to do some of the follow-on research that this work brings to mind, but probably not. As I said yesterday, doing something like this is slow, time consuming, and to many, boring. ( the work , not the results ) Not to mention that it takes a special intellect to keep it organized and comsumable by the masses. ” line-of-best-fit equations”, indeed!! 😉

• Thanks, Halfstep. I’ve got to say that I don’t know how B.B. does it! I imagine you get a LITTLE more efficient after doing this a lot, but this two-parter took me a couple months of shooting and writing, off-and-on. It IS fun — MOST of the time! I think this gun is pretty well covered now, but we’ve had a number of other good guest contributors that might think of something new to address, if not with this gun then on other topics.

11. Hi HiveSeeker

Thanks for a great report. When we had spoken before about field target, you said that you felt you were going to be to underpowered. I have TX 200 that was somewhat detuned before it came to me. I fire Barracuda Match 10.65 with 4.53 head size at 752 fps. According to Chair Gun at 10 yards it produces 11.89 foot pounds and at 55 yards 7.14 foot pounds. Chair Gun says with 800 fps and 7.9 CPL you would at 55 yards 5.95 foot pounds. 800 fps from a 24 inch .177 barrel I think is somewhat conservative, so I think you would be competitive. I would suggest H&F Field Target Trophy pellets if you try.

I hope to see you byline again.

• Hello Sp4449,

You make me wish I had a bigger backyard to play in! About 20 yards is the best I can do without traveling somewhere. Even at that range I notice a difference in accuracy with .22 pellets under 500 fps, and among these barrels only that long 24-incher hit 12 foot-pounds. My best pellet so far has been a very recent find, the Air Arms Heavy gave me my best 20-yard group out of my 14.6 inch Lothar Walther barrel, around 1/4″. This blog actually cut into my target shooting time so I haven’t been doing as much lately!

12. I thought hammer forged barrels were available in pretty much any length. There is a sourced of barrel liners that charges by the inch and I see no indication they could not make a very long barrel.

• Hi StevenG,

I don’t know much about those, but even the 24 inch barrel was a bit too long to be practical for me. However, I really liked that velocity and if I do happen to get another 2400KT it will probably be one with a 24 inch barrel that will stay. We’ll see!

13. HiveSeeker,

Thanks for the great reports on the Crosman pistols and different configurations. That is alot of data! Waiting that long between shots wow, good job. I definately will be refering to your reports.

If you go field taget I would consider using a Maximus barrel. I have one one a 1322 and it is very accurate. I have not tried the .177 Maximus barrel but hear they are just as good.

As long as I use the long steel breech I get better accuracy without the barrel band.

Can’t wait for the next blog, Thanks,
Don

• Benji-Don
Ok did miss something here.

Where do you put a barrel band at on a 1322?

The only barrel locating spot that I know that is on a 1322 is at the pump linkage pivot at the end of the pump tube.

• GF1,

You are absolutely correct. I ment to say 2240, sorry for the confusion. I been outside doing yard work and just got back in.

On the 2240 I get better groups without the barrel band. I use the long steel breech though. I still have not tried the Maximus barrel on a 2240.

I think the 2260 valve gives a little more power, I get more shots with a my 2240 than my 2260 both have the 24 inch 2260 barrel.

Don

• Benji-Don
It’s ok. And I actually have the barrel band on my Maximus moved back by the breech. So the barrel is floated on it. I get better groups with it that way.

And it sounds like the 2260 might have a different valve. But the inside diameter will do that also in the transfer port orifice. So the valves may be the same. And only the orifice might be different.

• GF1,

I just checked the sleeve (transfer port orifice) on the parts lists for the 2240 and 2260.

The 2240 is 1322A026 must be same as the 1322 good to know.

For the 2260 it shows the 1322A026 first and then:

8-1760-001 (8-1760) is for .177
or
7-2289-001 (7-2260) is for .22

Both the 2240 and 2250 show the same valve assembly 2250-003. So both their valves are from the 2250.

I am pretty sure that I have all three of the different sleeves (transfer port orifices) they are different colors. Guess I need to figure out the difference. I have not checked them but bet the 2260 has a bigger orifice. I will get back on the I.D.s of each one.

I am pretty sure they all are using the same seal 130-036 back to the 130 I suppose.

Good Question now if I can remember these tidbits.

Don

Don

• Benji-Don
Thanks for posting the part numbers. I have part numbers wrote down at home somewhere. Been awhile since I did the parts swap thing on the 2240 and 1322/77’s. And the Discovery’s.

But definitely post the inside diameter sizes with the transfer port and part number. That would be some good additional info for these guns.

• GF1,

The valve assemblies are the same in the 1740, 2240, 1760, and 2260 all basically the same gun except for the barrel, bolt and the length of the pressure tube and stock. Good to know.

Don

• Hi Benji-Don,

Thanks for the suggestion! So far the Lothar Walther barrels have been the most accurate for me, but I do wish they were available longer than 14.6 inches for more velocity. So the Maximus barrel is compatible with the steel breech — I’ll have to check around to see if anyone’s modding any of the CO2 guns with them. I THINK I’ve seen people using the Benjamin Discover barrel, but not the Maximus that I recall . . .

• Hiveseeker
A true compendium of 2240 platform information. I too feel the series is worthy of publishing, its full of great data that took a lot of time to acquire thank you for your effort. And great writing once again!

• Hiveseeker,

Perhaps a Maximus barrel cut to what you deem ideal and then re-crown? From what I recall, re-crowning can vary widely in style and did not look all that hard to do. It could be the Maximus barrel would be more accurate than even the L/W barrel? Just an idea. Chris

• I am pretty shure the maximus barrel is choked. If I get time I will check one out tomorrow and mabe put one on my 2240.

I think the Discovery and 2260 barrels are the same barrel. If I det time I will compare the 2260 barrel to the Maximus barrel on my 2240 at 25 yards.

Don

• Chris
But if the crowning is not concentric to the inside diameter of the bore you can get all kinds of accuracy problems.

Plus it needs to be burr free when completed.

14. Extremely professional set of reports. I would hope that the manufacturers could provide the same information– and would, but i doubt that many have spent the time to gather the data.

Anyway, thank you for your work.
Rob

• Thanks, Rco1234! Crosman is very tight-lipped about data on their Custom Shop guns, and I’m pretty sure it’s because it’s so variable between different barrel lengths — as we’ve seen here — as well as for at least two different valves they use. Throw out a number, and anyone not getting that velocity will be a dissatisfied customer! Also, I think for liability reasons they may view modding with some concerns which is understandable, so they may not want to provide information that might suggest they are encouraging it. I guess that’s where modders and enthusiasts come in!

15. HiveSeeker,

Great report and great data! I’ve wondered if there might be a point of diminishing returns in terms of barrel length. But as the barrels are not particularly expensive, it is better to show the point of maximum velocity – as you have done.

Thanks for all of the effort!

Dennis

• Hi Dennis,

Thank you. I THINK that’s what the theoretical projection graph showed, where velocity levels off and then actually begins to decline as the barrel gets longer. That information is not terribly practical — a barrel almost five feet long! — but it’s interesting to know what the theoretical limit is. More than welcome, and it was some effort — but ALL fun!

16. HiveSeeker
Bravo on your incredible amount of work testing barrel lengths. You were very generous to share your data with the rest of us. You are indeed a bonafide airgun addict to put that amount of time and effort, and many of us are glad you did.
I was very interested in your CO2 powered 2400KT Chimera testing as I just came into a CO2 powered Tau Brno 7 Junior pistol made in the Czech Republic. It’s in .177 cal, and gives me 40 good shots from 488-493 fps from it’s choked 210mm(8.2 inch) barrel using JSB Exact 7.33gr pellets. I thought it might give me more shots per CO2 capsule, as I also own the same brand 10 meter target Model 200 rifle from the 90’s, that gives me 72 good shots per CO2 capsule with the same pellet shooting through a shrouded 16 inch barrel. Like your Chimera being shot with the shorter barrels, the Tau 7 Junior pistol is quite loud, and you can see the excess CO2 being blown through holes in each side of the barrel weight. It’s ambidextrous walnut hand grip is comfortable, but it needs a heavier barrel weight for better accuracy. Mounting a red dot, or scope is not possible either.
Ciao
Titus

• Hello Titus,

Thank you, Sir! It was a labor of love, and one that I’m glad to share — as I wish I had been able to find all this data myself when I first started researching the 2400KT. I’m not familiar with that line but know that some interesting product has come out of the Czech Republic. The 72 shots from the rifle is a lot for a 12 gram CO2 cartridge!

17. Good Lord this way more useful information than I thought possible about one that’s in my small collection.
You’ve inspired me do do more with it.
Mine has the 10” LW barrel, black muzzle brake and the brass trigger shoe add just a little spice.

It is accurate, fun on close targets, and surprisingly effective on small pests. I’ve not done a chrony test i even that short barrel males pellets into pancakes.

Great fun for teaching kids.

Now I’ve got a lot of reading to do including all the comments.

• Hello Idaho,

Yours is a twin to my wife’s “Sassy Sandy”! The only difference is the gold trigger shoe — she went with black. Otherwise they should behave almost identically. I got down to about 0.25 inch CTC accuracy with her gun at 10 yards, and half that with a couple 9-out-of-10s. Check out Part 7 of the blog and you should pick up some good pellet recommendations:
/blog/2015/06/crosmans-2400kt-carbine-part-7/

• I’ll be reading The whole thing and doing some testing. I recall getting some tight groups even with limited pellet selection. I may look at the HPA option since I’m getting into that.

Thanks for all the great info.

I may name mine Sassy Andy.

I do think your wife might like some brass trigger bling.

• Hiveseeker,

It is 12/26/17 as I write this. Long story short, I got a 50\$ gift card for Walmart and ordered a 2240 for pick up on the 28th. at the local store.

The steel breech I can order, a barrel I can order, the rear stock I can order, (but not the CF one),… but I want a fore arm piece and am having trouble with finding one on line. Perhaps you can hit me up on the blog *(current)* with any ideas as you ARE the go to guy on these puppies. Would be willing consider all options.

Thanks and hope to hear from you,… Chris

18. Should read ” it needs a heavier barrel weight for better balance to get optimum accuracy”.
Titus

• I figured that. Though these guns are solidly built and do have some heft to them.

19. BB

A suggested topic would be pellet selection. In particular I’d like to know more about the actual science of what makes one gun coming off the same assembly line shoot better with a different pellet than a sibling gun.

There’s a lot that is relatively straight forward about pellet science like consistency of manufacture, one die lots, hardness of the lead, skirt thickness, matching precise pellet diameter to the gun etc. but to some degree it still seems mysterious how guns can be finicky.

Perhaps this has been covered well in an article already. if so please point me to it.

• Idaho,

I have mentioned it but never addressed it directly. That’s because there is no set of answers that always works. Anyone can make up anything they like about barrels and pellets and nobody can prove them wrong.

I did a 12-part test on twist rates and accuracy and I think it is the only time such a project has ever been published.

/blog/2013/07/how-does-rifling-twist-rate-affect-velocity-andor-accuracy-part-12/

B.B.

• B.B.

Actually is seems that it was a thirteen part test; /blog/2013/07/how-does-rifling-twist-rate-affect-velocity-andor-accuracy-part-13/

Mike

• BB
Thanks. Again. This blog is like a candy shop. Can’t believe its all free 🙂

20. does anyone know if there is a lothar walther 24 inch barrel available from crosman. thanks in advance for replies.

• thank you b.b. I have been lurking a long time and finally decided to join the discussion. one of my first airguns I bought was an air venturi bronco after reading your reports on it. still have it still love it. I shoot it better than my r7 most days. which just doesn’t seem right but it works for me.

• Edword,

I know there are many thousands like you who haven’t signed in to comment yet. When I write I’m thinking about them and what they would like to see.

Yes, the Bronco was a world-beater, wasn’t it? I’m proud to have been associated with it.

B.B.

• Edword
I searched and don’t see anything for a 24″ Lothar Walther barrel from Crosman.

• thank you gunfun1. I tried to go on crosmans site but was having trouble loading the page for the 2400kt for some reason

• Edword
Sometimes the Crosman site don’t load right for me either. I have to go back to the home page. Then back to the custom shop. Then it loads all the 190 pictures or whatever it is then it will work again.

And since we are on the barrel subject the new barrel process that Crosman has seems to be a winner. I think I saw it mentioned somewhere on their website too. But the Maximus barrels sure seem to be doing good with the new process.

Do you have a gun your wanting to put a barrel on?

• Edword
I haven’t had any of the custom shop guns but built many different ones from the Crosman Co2 and pump pistols were talking about.

The Crosman custom shop 2400KT would be a excellent first air gun. I don’t think you would be sorry if you got one.

21. One small FYI. I just noted on my 2400 a slight “wobble” between stock and action. Turns out the screw on the underside near the handgrip was slightly loose. This could easily go unnoticed and would surely degrade accuracy.

• Idaho
Have you seen my modded .22 Maximus?

But yep that happens. Especially have to watch the front screw legnth. If it’s too long it will contact the counterbore hole in the valve. That will push the valve to one side and cause leaks from the air resivoir around the tube. Well and the back screw legnth too. If it’s to long it will contact the striker spring.

But here’s my Maximus. And I don’t have the bi-pod legs on it right now. But yep love the 22xx, 1322/77, 1720T and Marauder pistol and so on.

• Idaho
Check this out. Don’t know if you seen it before.

This is actually a 1322 that I made into a pump rifle out of a Benjamin Discovery. It has the trigger assembly, steel breech and barrel and stock from a Discovery.

Not the best picture but you will see what I mean. And what I’m getting at is how universal these guns are for parts swapping. I can’t even remember all the different combination of guns I made.

Oh and I forgot it’s a short video. I don’t have a picture anymore.

22. GF
Very nice. The interchangeability is very cool. Lots of tinkering fun. I may get into that more when I completely retire.
I’ll eventually be looking for a budget friendly PCP for grandkids so they can outshoot me on the field target course I plan to build.

• Idaho
I’m not retired yet and you wouldn’t believe how many air guns I owned and built.

You should put one together to your liking. I think you would have fun.

Oh and by the way I have a Huma regulator in my Maximus too. Getting right at a bit under 70 shots on a 3000 psi fill. And that it is very accurate.

23. Hey HS…You inspired me to reset my password, so that I can commend your work! Thank you for compiling such comprehensive data on this topic!
I noticed the the different valves supplied with the custom shop guns, while trying to tune my second one with hipac. You have confirmed my suspicion!
We can add pics now? Cool!
I’m currently building a .177″ 14.6″ Lothar walather barreled gun for participation in a local field target club…
Thanks again!!!