by Tom Gaylord
Writing as B.B. Pelletier

Part 1
Part 2
Part 4
Part 5
Part 6
Part 7
Part 8

Today’s report is the continuation of a guest blog from reader HiveSeeker about his Crosman 2400KT.

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

Over to you, HiveSeeker.

Crosman 2400 KT
The 2400KT CO2 carbine is available exclusively from the Crosman Custom Shop.

This report covers:

• Shots per fill: .177 caliber
• Shots per fill: .22 caliber
• Mystified!
• A slow start

As we begin Part 3, I’m reminding my fellow blog readers that we’re looking at the Crosman 2400KT CO2 carbine from the Crosman Custom Shop in .177 and .22, and both are in their natural state — straight out of the box with no modifications.

Shots per fill: .177 caliber
We’ll start by looking at the number of shots per fill. Initially, I didn’t have any of B.B.’s favorite .177 boxed Crosman Premier Lights, so for testing Sassy Sandy’s .177, I chose the ballistically similar Crosman Premier Hollowpoint, which weighs exactly the same — 7.9 grains — and is also rather domed.

Crosman2400KT Sassy Sandy
The Sassy Sandy is a target carbine in .177 with 10.10-inch Lothar Walther choked match barrel, black custom shoulder stock, black trigger shoe and black muzzlebrake. The scope shown here is a CV Life 3-9×40. The cost of this setup was $142.68, not including scope and rings.

Performance should be almost identical (as we’ll later see with the Crosman pellets in .22). With this pellet, I got 40 good shots with the majority over 500 fps. Here’s my velocity table:

Crosman 2400 KT .177 shots per fill

Note that the average velocity varied by only 3 fps across the first 20 shots, and by only 9 fps across the first 30 shots. Smooth! Now, let’s take a look at the velocity graph:

Crosman 2400 KT .177 shots per fill graph
Here’s a nice, level velocity line. The .177 2400KT is one smooth operator in CO2 regulation and pellet velocity. Velocity begins to drop at about shot 28 (marked by the arrow), drops below 500 fps at shot 35, and declines below 400 fps after shot 40.

You can actually see what the velocity table has already told us — velocity control with this pistol is very even. This is something you really want in a target pistol. Velocity began to drop significantly at shot 28, sinking below 500 fps around shot 35. However, a great deal of subsequent shooting during accuracy testing showed that I could consistently expect 40 accurate shots before having to change to a fresh CO2 cartridge. Beyond 40 shots, velocity began to fall toward the 400 fps mark, and accuracy declined almost immediately. I stopped this test at shot 48, when velocity dipped below 300 fps, because I didn’t want to risk a pellet jammed in the barrel.

Forty shots per carttridge is right on the money for what Crosman advertises for the 2400KT’s .177 sibling, the Crosman 2300T. However, B.B. actually got 60 shots per cartridge out of that pistol when he tested it. His velocity with the 2300T averaged 520 fps for 7.9-grain Crosman Premier Lights. My testing with the same pellet in Sassy Sandy’s gun yielded an average 569 fps, so that extra 50 fps in velocity is where those extra 20 shots are probably going.

When B.B. reported on the 2400KT’s other .177 sibling, the high-end Crosman 2300S, he got an amazing 80 shots per CO2 cartridge. This was, again, higher than Crosman’s published specs on the gun — in this case 60 shots per cartridge. This pistol includes an adjustable power knob that controls the velocity. At the highest power setting, B.B. averaged 484 fps with 7.9-grain Crosman Copperhead pointed pellets [Editor’s note: I cannot find this pellet anywhere, so I linked you to the 7.9-grain Crosman pointed pellets], 85 fps less than my 569 fps in the 2400KT with the identical-weight Crosman Premier Light. B.B. got his 80 shots while testing the pistol on both low and high power settings, but he believed that performance would be similar to the 2300T — 60 shots per fill — if the velocity adjustment were left on high power all the time.

In summary, expect 40 good shots per fill from the Crosman 2400KT in .177. This is lower than the 60 shots per fill B.B. says you can expect from the 2300T and 2300S, but it comes with a gain of 50 to 85 fps in velocity.

Shots per fill: .22 caliber
For testing shots per fill for my HiveSeeker .22, I selected the 14.3-grain Domed Magnum from the Benjamin Ultimate Hunting Pellet Assortment. B.B. informs me that this pellet is identical to his favored boxed .22-caliber Crosman Premiers.

Crosman2400KT HiveSeeker
The HiveSeeker is a light-duty small game hunter .22 with 18-inch barrel, simulated carbon fiber custom shoulder stock, black trigger shoe, and black muzzle brake. The scope is a Leapers UTG 4-16×40. The cost of this setup was $123.57, not including scope and rings.

The Crosman Premier Ultra Magnum in the 500-pellet tin is also physically identical. However, the Benjamin Domed Magnum [from the box] specifically advertises single die production — like B.B.’s Crosman Premiers — so this was the pellet I chose as most comparable for the extensive shots-per-fill test. With the Domed Magnum, I got 30 good shots over 500 fps. Here’s my velocity table:

Crosman 2400 KT 22 shots per fill table

Velocity is more variable than we saw in .177, with average velocity varying by 5 fps across the first 20 shots, and 23 fps across the first 30 shots. However, in this case averages can be deceptive, because highs and lows can cancel each other out. When we take a look at the velocity graph, we see the whole story:

Crosman 2400 KT 22 shots per fill graph
This jagged velocity line tells us that CO2 regulation and pellet velocity are less consistent for the 2400KT in .22. Velocity begins to drop at about shot 25 (marked by the arrow), drops below 500 fps after shot 30, and declines below 400 fps as we approach shot 40.

Velocity for the 2400KT is much more variable in .22. A lot of ups and downs give an average that lands in the middle, but which doesn’t really represent all those peaks and valleys. Velocity began declining sharply at shot 25, sank below 500 fps at shot 30 — which proved to be the practical accuracy limit for this gun. They fell below 400 fps just before shot 40. Previous testing had already told me that accuracy dropped sharply after shot 30, so I pushed this test to shot 40 and simply stopped — there was no practical reason to take things any further.

When B.B. tested the 2400KT’s cousin, the .22-caliber Crosman 2240, he estimated most shooters would get 45 to 60 usable shots. He recorded an average velocity of 448 fps for the 2240 using his boxed 14.3-grain Crosman Premiers. The 2400KT trumps that at an average 573 fps — 125 fps faster! — with the equivalent Benjamin Domed Magnum, but at the cost of about half the usable shots.

When B.B. reported on the Crosman 2250XE, which is also a .22 CO2 carbine with an 18” barrel, he found exactly what I did with the 2400KT — up to 30 usable shots per CO2 cartridge. He got 546 fps with his boxed 14.3-grain Crosman Premiers, which approaches the 573 fps I got with the equivalent Benjamin Domed Magnum in the 2400KT. The 2250 (affectionately nicknamed the Ratcatcher by shooters) is no longer offered by the Crosman Custom Shop, but I think my HiveSeeker and the 2250XE are almost the same gun — except for that unique skeleton wood stock!

In summary, expect 30 accurate shots per fill from the Crosman 2400KT in .22. This is half the shots — at a 125 fps velocity gain — compared to the Crosman 2240, but very similar in both shot count and performance to the Crosman Outdoorsman 2250XE.

Those of you who got your coffee this morning have already noticed several very interesting things about these shots-per-fill graphs and the few velocities we’ve mentioned so far. First of all, both the .177 and .22 versions of the 2400KT have the same velocities. That can’t be right! Second, while 570 fps with a typical lead pellet isn’t too interesting for a .177, it is for a .22 non-PCP pistol! And those of you who had two cups of coffee this morning have noticed a smaller detail — for both calibers, velocity starts a little low before leveling off at a higher velocity as the shot count increases. Let’s knock out this last detail first.

A slow start
As I began my velocity testing of the 2400KT, I noticed that many pellets started with a very low initial velocity that increased significantly over the next few shots and then leveled out. This was truer of my wife’s .177 Sassy Sandy than it was for my .22 HiveSeeker. A few low velocities at the beginning of a 10-shot string can reduce a pellet’s velocity average, which will not be a good representation of that pellet’s overall performance. Take another look at those .177 and .22 velocity tables — this is why shots 1-10 average slower than shots 11-20 for both calibers.

Looking at my velocity graphs, I decided that to try to account for this, but still be accurate, I would start counting velocities at the point where two consecutive shots fell within 10 f.p.s. of each other. For many of the pellets I tested, this resulted in my discarding the first 2 or 3 shots, and taking my actual velocity average from around shots 4 through 13. This gives a much more representative picture of how each pellet is really performing once the pistol gets warmed up. I also noticed that velocity would sometimes continue to increase slightly throughout that 10-shot string, so the average velocities I present here may actually be slightly under-reported.

Crosman 2400 KT 177 slow start
Velocity starts low but increases rapidly, leveling off at shot 4. In this example, only the shots in the blue shaded area (shots 4 to 13) were used to calculate the pellet’s average velocity. You can see that those shots are much more representative of the pellet’s overall performance across the entire 10-shot string than the shots in the white area of the graph. This data is from the 7.9-grain .177 Crosman Premier Hollow Point Hunting Pellet.

Crosman 2400 KT 22 slow start
Again, velocity begins low but rises rapidly. It levels out at shot 4, and only shots 4 to 13 (in the blue shaded area of the graph) are used to calculate the 10-string average velocity. You can also see in this example that velocity continues to rise slightly across the entire string, so my average velocities might be slightly under-reported. Data is from the 14.3-grain Benjamin Discovery Hollow Point from the 500-pellet tin.

From these graphs, I’m confident that the velocities I’ll be reporting in Part 4 will be much more representative of how the Crosman 2400KT really performs. We’ll also try to solve our little mystery and then decide exactly how interesting those .22 velocities really are!