Posts Tagged ‘JSB Match Diabolo Exact Jumbo RS pellets’
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.
by Tom Gaylord, a.k.a. B.B. Pelletier
This is a third look at the Disco Double shooting at 50 yards. All I’ve managed to do so far is demonstrate the Disco Double is very consistently mediocre with the best pellets — JSB Exact Jumbo RS domes. However, the last time I was out at the range with this rifle, I finally did what the builder, Lloyd Sikes, has been telling me to do all along. He said to tighten the 6 screws on the 2 barrel bands or hangers, and this time I followed his directions. Guess what? Four of the 6 screws were loose! Imagine that! I tightened them and knew the rifle would reward me for the effort.
It was no surprise when shot the best 10-shot group ever with the rifle. Ten RS pellets went into 1.195 inches at 50 yards. But I was 3 shots into a second group when the bolt handle broke off in my hand during cocking. That ended the day for this rifle.
As soon as I returned home, I emailed Lloyd, who put a new bolt and handle in the mail right away. I really wanted to finish the test before leaving for the Ohio airgun show (which is this Saturday), so I disassembled the rifle. I ran into a problem getting the old bolt out, but a call to Lloyd set me on the right path and soon the job was done.
The new parts arrived the following week, and I had them in the rifle inside an hour — though another call to Lloyd was necessary. He was most helpful, and I resolved my problem with a minimum of fuss. The rifle went back together, and I was ready to return to the range.
This time, I took the opportunity to mount a new UTG 6-24X56 scope scope in place of the UTG True Hunter 3-9X40 scope I took off. Naturally, the target image was much larger with this scope, which just made my job easier.
I tried several pellets that I’ve tried before, but once more this rifle demonstrated that it likes the JSB Exact Jumbo RS pellets the best. Since the rifle had been taken apart for the bolt repair (i.e., both barrel bands had been removed), I was back at the beginning on the first group. I had the front band about where it had been before (from the screw marks in the paint), and the first group of 10 went into 1.28 inches at 50 yards. That was marginally better than the 1.317-inch group I’d gotten during the previous full test, but not quite as good as the one group I shot just before the bolt broke (1.193 inches). All the screws were tight, so now it was time to move the front barrel band.
In case you don’t understand what moving the front barrel band has to do with accuracy, it comes down to harmonics. By changing the location of where the barrel is anchored, I changed how the barrel vibrates during the shot. I did a huge 11-part test of this effect a few years ago. You can read about it here.
I moved the front barrel band backwards about a half inch and tightened the 3 screws once more. Then, I fired another group of 10 shots. This time, 10 RS pellets went into 0.816 inches. That’s pretty telling, don’t you think? Of course, I have no way of knowing if I have the barrel band adjusted perfectly — all I know is that it’s better than it was before.
A second 10-shot group went into 1.506 inches. Oops! Was that supposed to happen? Its difficult to say, but perhaps I wasn’t concentrating while shooting this group. I simply don’t know. Stuff happens to me, just like anyone else!
So I shot a third 10-shot group. This one measures 0.961 inches between centers. That’s better.
What I can tell you now is the that Disco Double is able to put 10 pellets into less than an inch at 50 yards under ideal conditions. I’ve shown you everything that’s happened, and I could go on and continue to test this rifle until I have it shooting its best. I probably will, in fact. But the lesson is what I’ve shown you today.
The Benjamin Discovery is an inexpensive PCP that can put 10 pellets into less than one inch at 50 yards under ideal conditions. The Disco Double I am testing for you here has a lot of extra work done to it and is not as inexpensive as the basic Discovery. However, this is the air rifle I wanted. It’s small, it’s accurate, it has a wonderful trigger and this one gets a load of shots on a fill of just 2,000 psi. That’s everything I wanted in a PCP.
Best of all, this rifle weighs no more and is no larger than a standard Discovery. Despite the additional air capacity, I had to sacrifice nothing. That was the real reason I had this air rifle built. Lloyd Sikes has a wonderful thing going here. If you’re interested in what he can do for you, find him at Airgun Lab.
by Tom Gaylord, a.k.a. B.B. Pelletier
This is a second look at the Disco Double at 50 yards. On this day at the range, the wind was quiet, so it was a good day to test.
I didn’t do anything to the rifle before this test because I didn’t have any time to stop long enough to clean the bore. So, it went uncleaned. I may have promised to do certain things before the next test, but all I actually did when the time came was grab the rifle and go back to the range.
I used the same black single sandbag you saw in the Daisy model 8 test earlier this week. The Disco Double perfectly fits the long groove of that bag and feels more secure than if it was in a conventional rifle rest.
The first group was made with 10 Beeman Kodiak pellets, and they were on target since I’d already zeroed this rifle at 50 yards for the earlier test. They initially stayed together, and I thought the rifle might have turned the corner. They then began to fly farther and farther apart. In the end, 10 pellets went into 1.837 inches — hardly a group worth mentioning. When I checked back to the previous test, though, I noted that this same pellet had made a group that was 2.458 inches at 50 yards; so as bad as it is, this was an improvement.
Okay, that wasn’t the brilliant opening I was anticipating. Even though the same pellet beat the last group by half an inch, it didn’t seem like the time to gloat. Next up were the JSB Exact Jumbo RS pellets — the most accurate pellets in the first 50-yard test.
The first group was another teaser. It looked small through the scope. It wasn’t until I measured it that I found out it went over an inch. Ten RS pellets went into 1.317 inches at 50 yards. That’s smaller than the smallest group from the previous test. There, 10 RS pellets went into 1.3418 inches at 50 yards. This group is similar, but it’s not crushingly better by any means.
I now have 2 groups — each of which is better than the same pellet in the previous test. One is significantly better; the other is only better by a whisker. What does that mean? Rather than try to answer that question, I decided to shoot another group. Surely, this one would be conclusive!
The next 10 RS pellets went into a 1.773-inch group. That was the hands-down worst group of both days of testing for this pellet. On the same day, shooting under the same conditions with the best pellet, I got both the best and worst groups this rifle had fired to date.
I’m sure someone can make sense out of these results — but I’m not that person! After 2 days of testing at 50 yards, I had not proven anything except that I can’t make this air rifle shoot — yet!
I considered shooting some more groups; but after looking at these results, I thought this wasn’t the day. Sometimes, the bear gets you!
I think what I’ll do is drag the Disco Double to the range every time I go and try to shoot different pellets each time. Maybe then I’ll stumble across the magic pellet that turns this rifle into a shooter. After testing similar rifles, I’m convinced this gun can shoot — I just haven’t yet discovered how.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today, we’ll look at the Disco Double out at 50 yards. I used the best pellets from the 25-yard test to speed up this test. No sense going over the same ground twice.
The first pellet I tried was the JSB Exact Jumbo RS. It did the best at 25 yards, plus it’s so light, at 13.43 grains, that it gives the rifle a little extra zing.
The rifle arrived at the range filled to 2,000 psi, so I went right to work. I clicked the scope up 5 clicks in elevation to account for the greater distance and began shooting. The day was surprisingly cold — about 28 degrees F. My trigger finger had very little feeling, yet I was able to feel when stage 2 engaged on the trigger every time. That’s important on this rifle because the trigger is very light on stage 2.
There was no wind on the range, which made this a perfect day for shooting a pellet rifle. The first 10 shots went into 1.558 inches between centers. That’s not as small as many 50-yard groups you’ve seen me shoot, but let’s keep testing.
Next up were .22-caliber Crosman Premiers. The first 3 shots went into 2.269-inches and I stopped shooting. These pellets weren’t going to work at 50 yards.
JSB Exact, 15.89 grains
Next up were the heavier 15.89-grain JSB Exact Jumbos that looked promising at 25 yards. They produced a 10-shot group that measured 1.778 inches between centers. It was a little larger than the JSB RS pellet group at 50 yards, just as it was a 25 yards. So far, no prize.
The last pellet I tried was the Beeman Kodiak, which just did fair at 25 yards. Here at 50 yards, they put 10 into 2.458 inches. That’s hardly accurate! I almost stopped shooting this group when I saw how the shots opened up; but I thought that after doing that with the Premiers, I ought to let one go the distance just to show you what it looked like.
Back to the JSB Exact RS
I wasn’t finished with the testing just yet. The rifle was topped off at 2,000 psi again, and I went back to the pellet that was giving me the best results — the JSB Exact RS. The next group of 10 was the tightest of the session, at 1.318 inches between centers. I’d adjusted the scope for the Kodiaks, so this one landed below the bull.
I then shot 2 more 10-shot groups with the RS pellet. The first measured 1.522 inches, and the second measured 1.543 inches. When I examined the target after bringing it back from downrange, I saw a pattern. The RS pellet wasn’t giving tight groups, but they were very consistent. Out of 4 groups, the total variance was 0.24 inches — from 1.3 to 1.5 and change. That’s pretty consistent.
What do we know?
We know this Disco Double can put 10 pellets into 0.365 inches at 25 yards. And with the same pellet, we know that it opens up to about 1.5 inches when the distance is doubled. We know it was warm when the 25-yard target was shot and cold when the 50-yard targets were shot.
And that’s about the only difference — other than I did remove the TKO silencer after shooting 25 yards. I think what I will do next is the following.
1. Clean the barrel.
2. Shoot 5 groups at 25 yards with the JSB Exact RS pellet.
3. Clean the barrel again.
4. Shoot another 5 targets at 50 yards.
One last feature I want to show you is the special optional barrel band Lloyd makes for the Disco Double. It has a Picatinny rail on the bottom, allowing you to attach a bipod at just the right spot with very little extra weight added to the gun.
When I originally tested the .22-caliber Benjamin Discovery rifle in 2007, it was a pre-production prototype that was made out of a Crosman 2260. I shot several approximately half-inch groups at 50 yards with Crosman Premier pellets, but they were 5-shot groups. Now, I’m shooting 10-shots groups that I know are going to be larger. I didn’t use the JSB Exact RS pellet because it didn’t exist back then.
I believe this lightweight Disco Double has more accuracy than we’ve seen to this point. I think it must be capable of shooting at least one 1-inch group out of 5 at 50 yards. So, the test continues.