Posts Tagged ‘JSB Match Diabolo Exact Jumbo RS pellets’
by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
Crosman 2240 conversion to air: Part 3
Crosman 2240 conversion to air: Part 2
Crosman 2240 conversion to air: Part 1
R.A.I. Adjustable AR Adapter for Crosman 2240 pistols: Part 2
R.A.I. Adjustable AR Adapter for Crosman 2240 pistols: Part 1
WARNING: This conversion changes the operation of the pistol to use air at up to three times the pressure it was designed for. The parts that are installed are strong, but there are other parts in the gun that aren’t changed and could fail when subjected to the higher pressures. Pyramyd Air advises anyone making such a conversion to exercise extreme caution.
This report covers:
• Sight-in at 12 feet
• Back to 25 yards
• End of the test
• Ft. Worth airgun show update
• Boot Campaign
Today, we’ll look at the accuracy of the 2240 on air at 25 yards. I’ve installed a 14.50-inch Crosman barrel on the gun, which boosted the velocity, as we saw last time. It also may have boosted the accuracy. Let’s find out.
The UTG Pro 6-Position Adjustable Stock has been remounted using the R.A.I. adapter. So, this is now a handy carbine.
I’m filling the pistol to 2250 psi, because I learned that was necessary when using the factory valve and a heavier striker spring. I get exactly 10 good shots per fill, which works well with my 10-shot groups.
For a sight, I installed the Tech Force TF90 dot sight that was used to test the Hakim rifle at 25 yards. We saw in that report how well this sight works, so it should work just as well on this carbine-sized gun I’ve assembled.
I sighted-in with 5 shots at 12 feet, and the gun was ready to shoot at 25 yards. I’ll show the sight-in target and explain it, so you can understand how this close sight-in works.
Sight-in at 12 feet
I sight-in at 12 feet because it’s safer. I know I’ll be on paper that close to the target, and I also know where the pellet needs to strike to be on at 20 yards. I used to sight-in all the rifles we sold at AirForce Airguns this way and was always on-target when I backed up to 23 yards. To learn more about this method, read this article.
What I’m looking for is the pellet landing in line (left and right) with the center of the bull, but as far below the center as the center of the sight is above the center of the bore. In other words, if you were to walk up to the target until the muzzle was touching the paper and center the dot (in this case) on the bull, where would the pellet strike the paper?
When you’re 10-12 feet back, the impact point doesn’t change much from that. But when you back up to 20 yards (20-30 yards, actually) the pellet rises up on the paper and ends up close to the aim point. It isn’t exact, but it’s the fastest way that I know to sight-in a pellet rifle.
My sight-in pellets were hitting the target a bit high, but not too high. Once they were centered, I left the sight where it was set and just backed up. I sighted-in with Crosman Premiers.
The first 3 pellets hit to the left of center. I adjusted the sight, and shot 4 hit to the right of center. I adjusted back to the left, and shot 5 was close to center. These are hitting too high at 12 feet, but I’ll use the setting as it is.
Back to 25 yards
The first group was fired with 14.3-grain Crosman Premier pellets. The first 3 pellets hit high and right of center. I don’t know how the rest of them hit, but you can see this is a fairly well-centered group of 10 shots. It measures 0.918 inches between centers, which isn’t too bad for a small gun like this at 25 yards. Remember — I’m shooting 10 shots instead of only 5.
Again, I must comment how nice and clear the TF90 sight is. It really holds a tight group – even though the target appears very small. That makes it a confidence-builder.
Next, I tried the JSB Exact Jumbo RS pellet. These often do well in lower-powered airguns. Remarkably, they went to the same point of impact as the Premiers. That means I don’t have to change the sight settings when using either pellet. This time, 10 RS pellets made a 0.763-inch group! That was very good, I thought. Especially given that I was using a dot sight!
End of the test
I’d planned on trying Beeman Devastator pellets next; but when I filled the gun, I noticed a leak at the joint of the HiPAC tank and the pistol’s tube. It was a fast leak and obviously the o-ring wasn’t doing its job. I tried oiling the gun with silicone chamber oil and refilling it, but the leak didn’t stop. So the test was over. I have to find out the problem and fix it if I can.
I do note that the pistol leaked down to 1750 psi and stopped. When I refilled it, the leak was much slower, so the oil may have done something. I think the o-ring and groove need to be cleaned and the tank installed again. But we’ll see.
At any rate, today’s test shows promising accuracy. It may not have been complete, but I’ll return to test the gun again at 25 yards. I plan to mount the TF90 on the Crosman 1077 next, so it may be a while before I get back to the 2240.
Ft. Worth airgun show update
The hotel is filling up fast for the show. Don’t forget to come to the reception at the hotel even if you aren’t staying there. It will be 7 p.m. to 8:30 p.m. Friday evening. Nothing fancy — just a chance to meet and talk about airguns before we set up Saturday morning.
I’ll be taking a caravan of people out to the range Friday afternoon from the hotel at 4 p.m. The range will be open earlier for people who want to get out there by themselves, but please tell me you are going, because this range is private. They need to know you’re coming or the gate will be locked.
We plan to start the door prize and raffle drawings very early after the show opens, and they’ll be held periodically throughout the day. Get there early and buy your raffle tickets for a chance to win a Walther LGV Competition Ultra, an AirForce Airguns CondorSS or a Hatsan AT44-10 Long QE! Since this show will probably not top a thousand attendees, you’ll have a real chance to win one of these fabulous rifles. And everyone who pays admission gets a chance to win an Air Venturi Bronco and a Benjamin Trail NP2 door prize!
Another group coming to the show is the Boot Campaign — a Texas-based nonprofit organization dedicated to the military (past and present) and their families — cultivating awareness, promoting patriotism and providing assistance.
Also, American Airgunner TV host Rossi Morreale will be attending the show, as he’s interviewing the ladies from the Boot Campaign.
I’ll have more news about the show as it develops.
by Tom Gaylord, a.k.a. B.B. Pelletier
This report covers:
• Lots of interest
• Mounted the scope
• The scope
• Initial accuracy
• Examine the baffles
• Back to Premiers
• Conventional artillery hold not right
• Found the secret
• Cocking effort
• Firing behavior
Today is like one of those pregnant pauses in a movie. You know what you want the hero (that’s either me or the Benjamin Trail Nitro Piston 2) to say, but he just won’t say it. The poorer the actor, the longer you wait. Not today.
The Benjamin Trail Nitro Piston 2 works!
Oh, there’s a lot to tell, and I’m far from finished with my evaluation, but that’s how the story will end. I want to tell you about the rough and rocky road it took to get to that point — and we aren’t quite there yet.
Mounted the scope
I’m going to start shooting for accuracy, so first I mounted the 3-9X32 CenterPoint scope on the rifle. Mounting was easy, and the scope aligned very well. Then, it was time to sight in the rifle. I always start at 12 feet from the target, so I know I’m on paper. I would start at 10 feet, but I have a door jamb at 12 feet, so there you go. The object is to get the pellet to hit in line with the center of the target and as far below the aim point as the center of the bore is below the center of the scope.
It took 3 shots to adjust the scope to the point that I knew the rifle would be close at 10 meters. Next, I set up a bench at 10 meters and proceeded to shoot several more shots — refining the zero. At 10 meters, I want to hit one inch below the aim point so the pellet will be on target at 20 yards. I’m going to shoot from 25 yards today; but as fast as this rifle shoots, it will be on the aim point between 20 and 30 yards, approximately, if I sight-in this way.
A couple more shots, and I was sighted-in. I went back to 25 yards and started shooting seriously.
Before we move on, I’ll comment on the scope. While it does have clear optics, the parallax isn’t adjusted for 25 yards; so, on 9x the bull was out of focus. One reader asked me for my observation and there it is. I think a scope for a rifle like this should have its parallax adjusted for 20-25 yards if the scope is going to have fixed parallax.
I began shooting with .22-caliber Crosman Premiers, as those are the pellets I felt might do the best in this rifle. The first couple shots went to my exact aim point, then they started dropping several inches below. I ended up with a nice group of 6 shots about 2 inches below the aim point and 4 more shots that ranged up to the aim point. All in all, not a very good group. I switched pellets.
I tried JSB Exact Jumbos next; but when the first 3 shots went into 1.50 inches, I stopped shooting. Next were Beeman Kodiak pellets. By shot 3, the group was already larger than an inch and a half, so I stopped. Finally, I tried some RWS Superdomes, and this time I stuck it out for 6 shots. They landed in 2-1/4 inches, and that stopped the whole show. Something was wrong!
Examine the baffles
Whenever I get wild or open groups like these from a gun that has baffles, I suspect the pellets are hitting the baffles or the end cap as they leave the gun. So, I shined a strong light down the muzzle and looked around all the baffles — looking for places where a pellet might have ripped off some of the plastic or left a gray streak. On aluminum baffles, a gray streak is what to look for, but these baffles are plastic, so I thought they might have been cut slightly.
But they looked perfect. They were completely round and there were no marks of any kind. I could see all the way down to the true muzzle of the gun, so I looked at the crown, to see if it was rough or out of round. And that’s when I saw it. Or, rather, I didn’t see it. I was unable to see the whole muzzle! Part of it was obscured by the last baffle! It was not in line with the bore!
The baffles are one cast piece of synthetic, and they’re separate from the shroud tube. I showed them to you in Part 1. They have rubber o-rings on each end of the baffle tube to center the baffles inside the shroud tube. But here’s the rub. The baffles, and not the shroud tube itself, thread onto the end of the barrel. The baffle tube has an end cap that holds tension against the shroud tube. Once the baffles are tight, everything is tight; but it’s still possible for the shroud tube to rotate. If that happens, it’s possible for the baffles to be misaligned with the muzzle of the barrel — or at least it is on my test rifle! All I had to do was rotate the shroud tube about 90 degrees, and then I could see the entire muzzle! It was time to shoot another group.
Back to Premiers
I went back to Crosman Premiers now that the muzzle was clear. The inside of the baffle tube looks like it has more than enough room for even a .25-caliber pellet to pass through without touching, so I figured it would be okay. This time, I shot a much better group of 10, with 8 pellets in 0.915 inches. The last 2 pellets opened the group to 1.748 inches, and they just looked wrong as I watched them fly to a different spot through the scope. Something was wrong, but I didn’t think it was the pellets.
Conventional artillery hold not right
I switched to H&N Field Target Trophy pellets. This time, they all landed in a nice 1.1357-inch group until the final 2 shots opened it to 1.704 inches. Clearly, something still wasn’t right, but I didn’t know what it was. However, I was starting to suspect that the conventional artillery hold isn’t right for the NP2.
I tried both Kodiaks and Superdomes, again — this time with the rifle rested directly on the sandbag. The results were about what you would expect when resting any breakbarrel springer directly on a bag — 3 shots scattering wide in 2-1/2- to 3-inch groups. Obviously, that’s the wrong thing to do!
I found the secret
I shot another 10-shot group of Premiers and experimented with the hold as I shot. When I firmly held the pistol grip, the group tightened up. When I relaxed in a traditional artillery hold, the shots went wild. The group looks bad at 2.508 inches overall, but 7 of those shots are in 1.042 inches and 5 are in 0.802 inches.
Next, I shot another 10-shot group of Premiers, With the pistol grip held tight, 10 shots went into 1.207 inches, with 9 going into 0.835 inches. Eight shots went into 0.514 inches. It’s not a smaller group overall, but there are more shots in the main group. I’m learning how to hold the rifle.
That was followed by another 10-shot group of Premiers. This time, 10 went into 1.178 inches, and 8 were in 0.721 inches. I was definitely learning how the NP2 wants to be held.
I said in Part 1 that the effort to cock the rifle was heavier than I remembered from the SHOT Show, and in Part 2 I gave the effort as 38 lbs. as measured on my bathroom scale. I also said in Part 2 that the rifle seemed to get easier as I tested the velocity, but testing it on the scale once more didn’t bear that out. Well, after today’s shooting, which added more than 70 shots to what was already on the gun, the cocking effort has dropped to 32 lbs. The rifle is getting into the area where it’s worth taking notice! Do you remember that I said it probably needs to be broken in? I may have proven that in this test, but I need to test the velocity, again, just to show that lighter cocking doesn’t also mean a loss of velocity.
After over 70 shots, I found myself tiring from the session, so I stopped; but the rifle didn’t seem that hard to cock. This is a surprising and happy revelation.
As I was shooting targets today, I found the trigger very heavy. I’ll try to adjust it lighter next time. It’s still smooth and crisp.
The gun still shoots dead calm without vibration, but the two-way recoil is very noticeable. I had to tighten the ring caps after the scope slipped 3/8 inch from recoil in the first 15 shots. That was my fault for not tightening the screws enough to begin with.
These groups are not what I had hoped for, but they do show that there’s a right way to hold the gun. I don’t think I have that hold perfected, yet, but I’m closer than when I began. I actually believe the NP2 is capable of much better groups than those you see today because there are smaller groups that look wonderful in each of the final groups.
Crosman said they were able to get one-hole groups at 35 yards. I’m not there yet, but I’m certainly able to put 5 out of 10 into a single hole at 25 yards. Next time, I’ll shoot only Premiers and will begin the test knowing how to hold the rifle. It should get better from there.
by Tom Gaylord, a.k.a. B.B. Pelletier
This report covers:
• Lots of interest
• Crosman’s quality inspection
• Velocity testing
• Cocking effort
• Trigger pull. and adjustment
• Firing behavior
• Evaluation so far
There has been a lot of talk about the new Benjamin Trail Nitro Piston 2 since it showed up three weeks ago. Some of that talk has been critical of certain faults. And some of it has been the pile-on of people who just wait to say bad things about a company.
After the first part of this report went live, I received the following email from Jennifer Lambert — Crosman’s vice-president of marketing.
“Tom, I have been reading and appreciating your reviews, the comments, and debate on NP2. I just wanted to write and clarify some of your comments around the origin of NP2. In your review you imply that the NP2 guns are not made here and that is not accurate.
While it is true that we use a mix of domestically made and imported components in the gun, I can assure you that every gun is built and quality tested right here in the U.S. in our Bloomfield factory. I will snap and send you some photos of the line and would be happy to take you on a tour and personally introduce you to some of the workers on it. And as sales of the Trail ramp up and we bring out more new guns in the NP2 platform, the number of jobs based here will continue to grow
If you have any questions or would like to discuss further please let me know, and keep the analysis coming.”
I told Jennifer I would restate my initial report. You can see the wording on the side of the gun. When something is worded like that rather than saying Made in the U.S.A., it draws attention to itself. We know that the parts can be manufactured outside the U.S., then brought in and assembled here. Many airguns are made that way, and I was pointing out that apparently this is one of them. However, after rereading what I said in Part 1, I see that I did go over the line.
I stand by my statement that the phrasing on the rifle means that some of the parts are sourced from outside the U.S. I did not mean to imply that the NP2 was assembled in another country. If I gave that impression, then I want to set the record straight. I do believe that the NP2 rifle is being assembled in the U.S. from parts and assemblies that are sourced from a variety of places — some of which are in this country and others that are not.
Crosman’s quality inspection
What Jennifer told me that I did not know was that Crosman does a quality inspection after assembly on each gun in their plant. I remember when they were launching the very successful Benjamin Discovery in 2007, Ed Schultz set up an assembly line in their New York plant that included a 24-hour pressure test for every gun they built. He said he did that until he was certain they were sealing the guns perfectly.
No company can afford to spend that much time on every airgun they make — it would break them. But when you’re launching a brand new product that has the potential for huge sales and represents an important step forward for the company, you take such measures.
We did the same thing at AirForce Airguns when we launched the new Condor in 2004. I personally tested and recorded the velocity of the first 100 rifles until we were certain that what we produced would always exceed the performance parameters we advertised for the gun. When you’re betting the farm on something, you take extraordinary steps to ensure your bet is a safe one!
The first pellet I tested in the NP2 was the .22-caliber Crosman Premier, a medium-weight pellet. Ten shots averaged 793 f.p.s. with a spread from 767 to 807 f.p.s. So, a spread of 40 f.p.s. At the average velocity, this pellet produces 19.97 foot-pounds of energy at the muzzle.
The second pellet I tested was the JSB Exact RS dome. Since it weighs 13.43 grains, you’d expect it to go faster than the 14.3-grain Premiers; but these pellets averaged 752 f.p.s. in the NP2. The spread went from 741 to 764 f.p.s., so 23 f.p.s. At the average velocity, these pellets generate 16.87 foot-pounds of muzzle energy.
The third pellet I tested was Crosman’s own SSP lead-free alloy pellet. At 9.5 grains weight, these are the pellets you’d expect to go the fastest. Crosman advertises 1100 to 1200 f.p.s. with alloy pellets for this rifle, depending on where you look. [Note: The box states 950 f.p.s. with lead, 1100 f.p.s. with alloy pellets. The Crosman website states 900 f.p.s. with lead, 1200 f.p.s. with alloy pellets.] In the test rifle, they averaged 949 f.p.s. and spread from 939 to 964 f.p.s. A 25 f.p.s. spread. At the average velocity, this pellet produces 19 foot-pounds of energy at the muzzle.
I know there will be a cry of “foul” on these numbers because of the advertised velocity, but in my opinion, this is exactly where I want this rifle to be. If it shoots this fast and is also accurate, the NP2 is definitely worth consideration. I’m on record as saying the same thing about the Walther LGV Challenger when I tested it back in 2013, so at least I’m consistent.
I measured the cocking effort after publishing Part 1 and found it to be 38 lbs. But during this velocity test, it seemed like I was growing stronger. So I measured the effort again, and it still measures 38 lbs. What’s different now is much of the cocking friction has gone from the stroke. It actually does feel lighter now than it did before.
How does that compare to other gas-spring rifles? The powerful ones cock with between 40 and 60 lbs. of force, so the NP2 is definitely on the lighter side. To put it into perspective, it cocks about like a Beeman R1 after break-in.
I said in Part 1 that the trigger-pull was creepy. So, I adjusted the single screw located behind the trigger. I unscrewed it about 2 full turns and the trigger became exactly like the one I tested at the SHOT Show. It now has a long first-stage pull that measures 3 lbs., 4 oz., then a crisp second stage that releases at 4 lbs., 4 oz. You can take up the first stage and just wait at stage 2 until you’re ready to fire. Then, just one pound more fires the gun. I really like this trigger!
Experienced airgunners won’t believe how smooth this rifle is. The pulse of the shot is strong (a strong two-way push), but there’s no vibration. It’s dead smooth! You would pay hundreds of dollars to get a coiled spring gun this smooth.
The test NP2 is very quiet! The shooter hears the noise through the stock against his face, but a bystander hears a much lower discharge sound. During velocity testing, I was also assaulted by the instant hit of the pellet in the trap in front of me. I suspect that when I shoot for accuracy, I’ll get a better feeling for the sound.
Evaluation so far
I’m no longer at the SHOT Show. I’m in my office where I can control the testing and the evaluation. People are not telling me things — I’m finding them out on my own. And the Nitro Piston 2 I have is testing very well.
Sure you can make a big deal out of the velocity being lower than advertised. But I never wanted that advertised velocity to begin with. I wanted what this gun has — solid numbers in the 750-800s with practical .22-caliber lead pellets that I’ll probably use.
The firing behavior and trigger are exactly as they were at SHOT, which is to say stunning for a gas-spring rifle of this power. Although the cocking effort measures higher than expected, it isn’t bad for a spring rifle that shoots this fast.
Yes, there have been some quality problems in the first batch of guns that went out. There were cracks in some plastic parts and some scope bases fell off the guns. If that happened to you, you have every right to be angry; but the rest of the public should know that Crosman is doing something about it. Everyone who experienced a problem with their rifle will be taken care of by Crosman, and you can be sure that they’re refining their in-house quality assurance program to correct future shipments. They want the NP2 to succeed because of how important it is to their business.
I want it to succeed for my own reasons. This is a $250 air rifle, and there aren’t many of them around that have what this rifle has. We need a good gun in this price range, and I’m hoping the NP2 is it.
What remains to be seen is the accuracy. If this rifle is accurate, I will buy the one I’m testing because this is too important an airgun for me not to own.