Posts Tagged ‘Crosman SSP pellets’
by Tom Gaylord, a.k.a. B.B. Pelletier
Today, we’ll look at the velocity of the Daisy 880 multi-pump pneumatic. The test didn’t go as I expected it to, so stick around and learn something new with me.
Oil the pump head
Before I started the test, I oiled the 880′s pump head with several drops of Crosman Pellgunoil. I do that whenever I want to get the maximum performance from a multi-pump pneumatic, because the oil seals the pump head, allowing it to build more pressure.
First test — velocity per pump stroke
This is a test I recommend to all multi-pump owners. You test the velocity of your gun with differing pump strokes — from the lowest number recommended in the manual, which is 2 in this case, to the highest number, which is 10. [Note: In part 1, I stated that the minimum number of pumps was 3. It's actually 2, and the Pyramyd Air website has been corrected to reflect that.] For this test, I also did 11 and 12 pump strokes to see if the gun had even more velocity. The results were revealing. I’ll discuss them in a moment.
The pellet I used was the 7.9-grain Crosman Premier dome. Any pellet will do, but it helps if you always pick the same one in case you ever want to compare one gun to another.
* No air remaining in the gun after this shot.
For those who may be new to multi-pumps, notice that as the number of pump strokes increases, the amount of the velocity increase grows smaller. If you were pumping the gun, you would have noticed that after the fourth pump stroke (from 5 strokes on) the pump handle jumped out when I pulled it for the next stroke. Compressed air is remains in front of the pump head and does not enter the gun’s reservoir. As the pressure inside the reservoir builds, it holds the inlet valve closed a little harder each time; so, more compressed air fails to enter the reservoir. This phenomenon is common to all multi-pumps, and many of the more expensive ones have (or used to have) adjustable pump heads that minimize this; but the 880 doesn’t have any adjustment.
Note that there’s no air remaining in the gun after a shot was fired on 10 pumps. That means the gun is able to exhaust all the compressed air. From the velocity chart, we learn there’s no value in pumping the gun more than 10 times.
This is where I learned a couple big lessons about the 880 — or at least about my 880. Normally, a multi-pump is very consistent. The same number of pump strokes will give nearly the same velocity every time, as long as the same pellets are used. I’m used to seeing a velocity variation of about 5-8 f.p.s. over a 10-shot string. But not this time!
The 880 gave an average of 469 f.p.s. for 10 shots with 5 pump strokes. If you look at the string before, however, you’ll see that this velocity is well below what I got with 5 pump strokes (530 f.p.s.) and the very same pellet. Even stranger is the fact that, on this test, the velocity spread went from a low of 441 f.p.s. to a high of 502 f.p.s. That’s a variation of 61 f.p.s. over 10 shots. And not one of those 10 shots went as fast as the same pellet did on 5 pump strokes in the previous test!
The Daisy 880 varies greatly in velocity from test to test. You may think this is because my 880 is an older one. I can’t argue that. If you want to run the same test with a more modern 880 and submit your results, I’d be glad to see them, but please back up any claims you make with chronograph results.
RWS Hobby pellets
Next, I tested the rifle with RWS Hobby pellets fired on 10 pumps. These pellets averaged 600 f.p.s.; but, once again, the spread was very large. The low was 559 f.p.s. while the high was 643 f.p.s. That’s a variation of 86 f.p.s.
How fast will it shoot?
I tried a string of Crosman Super Sonic pellets on 10 pumps. They averaged 690 f.p.s. Again, the spread was very large — from 648 to 722 f.p.s. That’s 74 f.p.s. I only did this to see how fast the gun could shoot. The owner’s manual online says the maximum is 715 f.p.s with pellets, and we saw just a little more. So, that claim is right on.
Finally, I tried the rifle with Daisy Premium Grade BBs. On 5 pumps, they averaged 578 f.p.s. with a low of 565 and a high of 586 f.p.s. On 10 pumps, they averaged 644 f.p.s., with a low of 632 and a high of 657 f.p.s. So the gun is much slower than advertised (750 f.p.s.) with BBs, but the velocity spread is a lot less than it is with pellets.
I was surprised by the large velocity variation I saw with the 880. This is not just the largest variation I’ve ever seen with a multi-pump, it’s many times larger than the next largest variation. Multi-pumps are very consistent, in my experience.
Will this large variation have any affect on accuracy? Probably not at 10 meters, but it almost certainly will at 25 yards. I plan to shoot the rifle at both distances, so we shall see.
by Tom Gaylord, a.k.a. B.B. Pelletier
Happy New Year! 2014 promises to be a wonderful year for airguns, and we all will have a lot to celebrate. Edith and I wish all of you a healthy and prosperous New Year.
Lots to cover today, so let’s begin. This is the day we test the velocity of the Crosman MK-177 multi-pump pneumatic.
First things first
There’s a storage compartment in the butt, but Crosman doesn’t tell you how to access it. The black rubber buttpad is just a rubber cover with a lip that goes into a channel on the buttstock. The cover comes off like a jar lid. Don’t try to pry it off with a knife or a screwdriver because you’ll mar the plastic. Instead, grab the whole buttpad sideways and roll it off the butt. It was too difficult to do with my hands at first, so I used a pair of channel-lock pliers and it rolled right off. After 3 times though, I could roll it off at will. Be careful not to crush the plastic buttstock when doing this.
Next, I was wrong when I said the bolt handle is okay on the left side of the gun. Because you have to manually advance the magazine, which is on the right side, having the bolt on the left does make cocking and loading the gun clumsy. However, if you look at where the BB magazine is located (on the right side) Crosman put the cocking handle on the left because they had to. This is something that I think could stand some attention.
Next, I told you the pump handle is hard to pull away from the gun. Several readers agreed with me, but one reader told me to shift my pumping hand so it wasn’t so close to the end of the pump handle. When I did that (held the pump handle in about the middle), the handle easily came away from the rifle and the problem was solved. It does come home with a very loud clack, though.
And, finally, I forgot to mention that when you shoot BBs you have to leave the pellet magazine installed. It doesn’t have to be advanced, but the bolt uses 1 of the 5 pellet slots as a guide to push the BB through when you load a BB.
BBs have been put into the gravity-fed BB magazine and you can see them though the slots cut into the right side of the receiver. The pellet magazine must be installed (but not moved) to guide the BBs into the barrel.
Velocity with Crosman Premier lite pellets
The Crosman Premier lite pellet is a domed lead pellet weighing 7.9 grains. That makes it a medium-weight .177-caliber pellet. Instead of giving you averages for the various numbers of pump strokes, here’s a list of the velocities per pump stroke from 3 to 10 strokes.
After the final shot, I cocked the bolt and fired the gun. No air was exhausted.
Then, I shot 5 shots of Premier lites with 5 pumps each. The average was 499 f.p.s., and the range went from 491 to 503 f.p.s.
Crosman SSP pointed pellet
Next I shot the 4 grain lead-free Crosman SSP pellet. Again, I’ll give a string of velocities as the number of pump strokes increases.
After I fired the last shot, I cocked the bolt and fired the gun again. No air was exhausted. So, I did something that I don’t recommend, just to show what happens. I pumped the rifle 12 strokes and achieved a velocity of 762 f.p.s. with this lightweight pellet. Then, I cocked again and fired. No air was exhausted.
You can see that the velocity increases start to get smaller after 6 pump strokes. Those last few strokes (9 and 10) don’t really add a lot more velocity, making them hardly worth the extra effort.
Next, I filled the BB magazine with Crosman Copperhead BBs and did the same test.
Following this test, I pumped the rifle 5 times for each of 5 shots and got an average velocity of 564 f.p.s. The low was 560, and the high was 567 f.p.s.
It seems obvious that BBs will go faster on fewer pump strokes; but when the number of strokes increases, the lead-free pellet goes even faster. It’s more than a full grain lighter; and, of course, it seals the bore better than the BB.
The last thing I’ll comment on is the trigger. I said I thought it was a good one in Part 1. Well, that was confirmed in this test. Though it’s only single-stage and the pull is long, it’s free from creep and is light enough to be a delight. It fires with 2 lbs., 8 ozs. of pressure.
So far, I like the rifle a lot. It takes some getting used to — expecially that bolt handle location and finding the proper method of grasping the pump handle so it operates smoothly. I don’t like the loud clack when the pump handle comes home, but I bet a small piece of rubber padding could take care of that rather well.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today, I’m testing the Crosman MTR77NP scoped air rifle for accuracy at 25 yards. This is going to be a very different accuracy report, for I have no targets to show you. Well, there is one target, but it wasn’t shot with the test rifle.
In the last report, I mentioned that I wanted to mount a different scope on the test rifle and test it at 25 yards. I thought the Bug Buster 3-9x scope would be a good one, and I also shimmed under the rear ring because the rifle was shooting low in the 10-meter test.
I thought the rifle would group about 3 times larger at 25 yards than it had at 10 meters, but I also hoped some pellets might remain tighter than that. What happened, however, was just the reverse. Instead of 3-inch groups I got 5- to 6-inch “patterns.” I won’t call them groups because not all pellets fired even hit the target trap. And when that happens, I stop shooting that particular pellet immediately.
Crosman Premier lites
First up was the pellet I thought had the best chance to do well — the 7.9-grain Crosman Premier. They had done well at 10 meters with just 2 pellets outside the main group. Had they held to my 3X size increase, they would have grouped into about 2.2 inches; but when the third shot landed 6 inches away from shots 1 and 2, and then shot 4 landed 5 inches from that pellet, I stopped shooting.
I checked the scope mount to see that it was still tight. It was, and I’m pretty sure this scope is a good one because it has done well in other tests on other airguns. So, Premier lites are out.
H&N Baracuda Match
Next, I tried some H&N Baracuda Match pellets. But they were no better. They hit the target lower than the Premiers, and 3 shots landed in about a 5-inch pattern. Then, one pellet missed the target trap altogether. I stopped shooting after that shot, but I wasn’t done with this pellet.
I got the Air Venturi Pellet Pen and Seater and deep-seated a couple Premier lites to see what affect that would have. The point of impact changed, but the accuracy didn’t improve. And when the third shot missed the trap, I stopped shooting Baracudas.
The next pellet I tried was the RWS Hobby, which gave such a nice, round group at 10 meters. Two shots landed together, and I thought we were on the right road; then the next shot hit about 6 inches away from them. The 4th shot missed the trap altogether, and I stopped shooting that pellet.
By now, I was in a quandary. Was it me or the gun or the scope? I went back to 12 feet from the target and confirmed that the scope was still shooting to the same point, then I went back to 25 yards and tried an RWS Superdome. I had confirmed at 12 feet that the Superdome would be on paper at 25 yards and the first shot was. It landed high, but in good enough position to keep shooting. The next shot missed the paper altogether and I don’t know where it went. That was it for Superdomes.
What to do?
By this point I was really shaken. My confidence was ebbing fast and I needed to end this session on a high note. So I grabbed my Beeman R8 Tyrolean and a tin of Air Arms Falcon pellets and shot a final group of 10 at 25 yards. This one turned out good, as I expected it would. That’s where today’s target comes from. It isn’t the best group I’ve shot with the R8, but it’s a darn sight better than I did with the MTR77NP. Ten shots went into 0.41 inches.
I need some time to think about why this rifle might be performing like it is. If one of you made a report like this to me, I would tell you to check the scope because that sure seems like what it is. But I did check the scope and found no problems. The one thing left to do is to crank the elevation down all the way and all the way to the left and shoot a group. If it tightens up, then it was the scope. If not, it’s either the mounts or the rifle.
A little tip
What I did with the R8 today is a handy tip to remember. Sometimes the problem is you — or you wonder if it might be. Shooting a good group with a rifle of known accuracy is the best way to rule that out.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today, we’ll look at the first of 2 accuracy tests planned for the Crosman MTR77NP scoped air rifle. As you know, this rifle has no open sights; so, the first thing I did was mount the Centerpoint 4X32 scope that’s included with the gun. That went quick because the scope caps have 2 screws each, but there was no slippage of the scope in the rings during this test.
The scope is very bright as you would expect a 4X scope to be, but at the 10-meter distance I shot in this test, it was fuzzy. The parallax is fixed for a further distance that isn’t indicated on the scope. I can tell from examination that it’s set farther than 25 yards.
I’m testing at 10 meters today and will take the best pellets into the next test, which will be at 25 yards. The first pellet up was the 7.9-grain Crosman Premier. You will remember from the velocity test that the test rifle shoots considerably slower than its advertised velocity of 1,000 f.p.s. with lead pellets. It went an average of 866 f.p.s. with 7-grain RWS Hobbys.
I discovered that the rifle is shooting low, even with the scope adjusted up high. For the next test, I’ll shim the rear scope ring. That should raise the pellet up far enough.
Crosman Premier lites
At 10 meters, 10 Premier lite pellets made a group that measures 0.721 inches between centers. The group has a main group of 8 pellets within it and 2 flyers, though there were no shots that were pulled. This is a case where a better scope might do better on target because the image was so fuzzy that I might have been off the aim point by 1/8 inch at times.
The MTR77NP fires with a solid thump. There’s no vibration, and the shot cycle is very quick. The recoil through the butt isn’t sharp the way it is on many gas-spring air rifles. And the A2 stock seems to be ideal for handling the recoil of this rifle without stinging your cheek.
Now that I’ve shot the gun for accuracy, I can tell you the trigger-pull is very long in stage 2. The pull length of stage 2 is supposed to be adjustable, but I turned in the screw about 7 full turns and nothing changed. It feels like a placebo screw; or if it does adjust anything, the effect is very small.
H&N Baracuda Match
The next pellet I tested was the heavy H&N Baracuda Match. This pellet showed some promise in the velocity test, and I thought it might do well in this rifle. Ten of them went into a group that measured 0.982 inches between centers. Like the Premier lite, there were flyers outside the main group, though I did not see them when shooting. I’m beginning to think that the next test needs to be conducted with a different scope.
The scope mounts had loosened by this point in the test. The rings remained tight, but the screws that attach the rings to the base on the rifle loosened up. I tightened them and also checked them after every 5 shots from this point on.
Next, I tried 10 RWS Hobby pellets. They went much lower and also to the left. They actually missed the target paper. The group was round and measured 0.826 inches between centers.
Crosman SSP Hollowpoint
I did check the Crosman SSP hollowpoint that was the lead-free pellet I tested in the velocity test, but after 2 pellets missed the target backer altogether, I stopped shooting. Not the pellet for this rifle.
JSB Exact Express
The last pellet I tested was the 7.87-grain JSB Exact Express dome. I haven’t had much luck with this pellet in the past, but I keep trying it just in case. Alas, the MTR77NP doesn’t like it, either. Ten pellets went into a vertical 1.661 inches at 10 meters. Another pellet to not use in this rifle.
Evaluation so far
I like the way the rifle feels when it fires. It has good power and a solid thump when it fires. The trigger-pull is long but not too creepy.
The scope leaves a lot to be desired. I think I’ll replace it with a Bug Buster 3-9X scope for the next test, and I’ll shim the rear scope ring before mounting it on the rifle. That should give the rifle the best chance to do well at 25 yards.
Obviously, the pellets to try are the Crosman Premier lite, the H&N Baracuda and the RWS Hobby. The Hobbys will be at their maximum recommended distance, but they may surprise us.
If you like black rifles and have been considering the MTR77NP, I think it’s worth a look. We’ll know better after the next test.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today, we’ll test the velocity of the .177-caliber Crosman MTR77NP scoped air rifle. This rifle has a Nitro Piston, which is Crosman’s gas spring, so it should be interesting. The advertised velocity is 1,200 f.p.s., which we must assume is with a lightweight, lead-free pellet.
Blog reader John asked me if the front sight base is on tight or does if it rotates around the barrel. The one on this rifle is firmly in place, but I thought it would be good to show you how the front sight base is attached to the rifle. It’s part of a synthetic sleeve that goes over the end of the barrel, and I assume it’s held in place by epoxy. That would be the most cost-effective method of doing it. John mentioned the possibility of a splined barrel and jacket, but that has a number of problems. It involves extra manufacturing steps (the cutting of the splines); plus, it runs the risk of being installed in a not-perfectly-straight orientation that would cause a lot of problems with sales and returns. Epoxy has none of those problems and costs very little.
The advertised cocking effort is 45 lbs. The test rifle cocks with 42 lbs. of effort as measured on my bathroom scale.
Crosman Premier heavy
The first pellet I tested was the 10.5-grain Crosman Premier heavy. Because this rifle comes in .177 caliber, I had a choice between these and the lighter 7.9-grain Premier lites. I chose the heavier pellets because of the rifle’s power potential; but as you’ll now see, that wasn’t necessary.
Premier heavys averaged 675 f.p.s. through this rifle. The first measured shot from the gun went 705 f.p.s.; but after that, nothing went faster than 681 f.p.s. with this pellet. I threw out the first shot and ran the string from the second shot forward. The high was 681 f.p.s., which happened at the beginning and near the end of the string. The low was 665 f.p.s on the final shot. The spread of shots in this string is 16 f.p.s. At the average velocity, this pellet produces 10.63 foot-pounds of muzzle energy.
Next, I tested the RWS Hobby pellet that’s used for all legitimate velocity comparisons. It’s not a super-lightweight pellet and is made of pure lead, so the lubricity in the bore is what you want in a diabolo pellet. In the test rifle, Hobbys averaged 866 f.p.s., which is a good velocity for accuracy but a little slow for a rifle that hopes to see 1,200 f.p.s. with super-lightweight pellets.
The spread for this pellet ranged from a low of 856 to a high of 872 f.p.s., for a spread of 16 f.p.s. At the average velocity, Hobbys produced 11.66 foot-pounds of energy.
I tested the H&N Baracuda Match next. Normally, a rifle shooting this slow would be considered too weak for Baracudas, but I thought their all-lead content might speed them ahead of the Premier Heavys that are hardened with antimony. And it did! In spite of being 1.15 grains heavier than the Premiers, Baracuda Match pellets averaged 685 f.p.s., which is 10 f.p.s. faster. The range went from 677 to 692 f.p.s., for a total spread of 14 f.p.s.
I think this pellet might surprise us with its accuracy. I certainly intend to include it in the test.
Crosman SSP hollowpoint
The final pellet I tested was the lead-free, super-lightweight Crosman SSP hollowpoint. If anything is going to go 1,200 f.p.s in this rifle, it’s this 4-grain pellet.
They averaged 1094 f.p.s. in the test rifle, but the velocity spread was huge! The slowest pellet went 1018 f.p.s., while the fastest went 1142 f.p.s. That’s a spread of 124 f.p.s. After seeing how this pellet did for accuracy in the Fusion, I’m temped not to test it in the MTR77NP; but if I do a 10-meter test to start with, I could risk it.
Now that I’ve had some more time to assess it, I can make a better report on the MTR77NP’s trigger. It’s a 2-stage pull that feels more like a single-stage pull that has some slack before it engages. Stage 2 is very long and has some creep, but not a lot. For you newer readers, trigger travel is when you can feel the blade move and creep is when it stops and starts (is gritty or jerky) throughout the movement. Movement by itself isn’t bad; but with too much creep, you never know what’s happening. The MTR77NP trigger is not too creepy for good trigger control.
Evaluation thus far
I remain optimistic about the MTR77NP. I like the fact that the velocity is not over the top. Perhaps that explains the slightly easier cocking effort of the test rifle. Whatever it is, it fits my idea of what an air rifle should be.
I’m not a fan of gas springs, but there have been a couple I really liked. The Benjamin Legacy and the Benjamin Trail NP with lower velocity are 2 rifles that satisfied my criterion for what a decent air rifle should have and be able to do. Will the NTR77NP follow in their footsteps? We shall see.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today is the first accuracy test of the Umarex Fusion CO2 rifle. It comes one part late because we spent time looking at the CO2 cap, the adjustable trigger and the power adjuster in Part 3. The power adjuster is straightforward — twist the screw in and increase the striker spring tension to increase power. The trigger, we learned, is adjustable, but the safety slider prevents a very wide range of adjustability. You can modify it if you choose, but I don’t recommend it; and it will void any warranty on the gun. Blog reader mikeiniowa explained how it’s done, but he said to use caution — and I don’t intend doing it to the test gun.
You should now understand how the CO2 cap works, but there’s one additional thing that I think needs to be stressed. The gas exhaust screw on the cap is to use after the CO2 has been depleted. Screw it in and exhaust the remaining pressure. But that isn’t the end because the cap still cannot be taken off safely, as a reader mentioned yesterday. The o-ring that absorbs gas has to be given a lot of time to exhaust that gas and shrink back down to normal size before you attempt to remove the cap. If you try to remove the cap too soon after exhausting the gas, the o-ring will still be swollen and tightly wedged in place. You could tear it if you use too much force on the cap. So, let an hour or two pass before you try to remove the cap; and leave the exhaust screw screwed in, so the remaining gas that leaves the o-ring can get out of the gun. Anyone who has ever owned a Schimel CO2 pistol knows what I am talking about because they had the same problem.
Mounting the scope
The Fusion comes with a 4X32 scope and rings that must be mounted on the gun. The rings are made to clear the rounded receiver top, so don’t think just any rings will work. I want to show you what one of the rings looks like after installation, so you don’t go nuts thinking it’s not on the gun squarely.
The Fusion receiver is rounded on top, so the bottom of the scope ring must be profiled to clear the hump. The rings that come with the gun are correctly shaped for this. Don’t let the cockeyed jaw piece fool you — this ring is on the rifle straight and tight!
The scope caps have 2 screws each, which is perfect for this gun. There’s no recoil, so 2 screws hold the scope tight enough for good accuracy.
Once the scope was mounted, I sighted-in at 10 meters. All of today’s shooting will be from 10 meters for reasons I will explain as we go. I’m telling you that because the groups will be smaller than if they were shot at 25 yards. I do plan on testing the Fusion at 25 yards, too, but first I have to establish what it can do closer.
One additional thing about the sight-in. All the pellets struck the target low at 10 meters. I accepted that for the whole test, and I had to adjust the scope up very high to even get that. You know how nervous that makes me! So, at the end of this test I’ll shim the rear scope ring and try one more group with the best pellet. The groups you’ll be seeing are either low on the bull or just beneath it.
JSB Exact RS
The first group was shot with the JSB Exact RS pellet. As I shot, I could see all the pellets going into the same place; although with the 4x scope, it wasn’t easy to see exactly how good it was until I went downrange. It turned out that 10 pellets made a 0.286-inch group, measured between centers. And this group is very round, which is a good sign that everything is right with the rifle.
I observed several things while shooting the first group. The first is the trigger, while having a very long second stage pull that you can feel, is very controllable. Next, I did find the rifle just a bit fiddly to load. Once I got the hang of it, however, I was able to load pretty fast. But the pellets tend to flip around in the trough — especially the domes!
And, finally, I noted how very quiet the Fusion is! Our female cat, who usually walks around the house complaining every time I shoot, found it hard to hear what I was doing unless she was in the room with me. Even then, the noise didn’t seem to bother her, though Edith did say she walked into her office to complain once. Other than that, she was quiet. I think any apartment-dweller could shoot this rifle indoors without bothering the neighbors.
H&N Baracuda Match
Next, it was time to test the H&N Baracuda Match pellets. They landed higher on the target than the RS pellets but were still below the point of aim. This group measured 0.345 inches and was just as round as the RS group.
Crosman SSP hollowpoint
Then I tried the lightweight lead-free Crosman SSP hollowpoint. I didn’t expect much from these pellets, but I tried them because I’d used them in the velocity test. They produced a 10-shot group that measures 1.66 inches between centers. Obviously, I’m not going to shoot this pellet at 25 yards and risk hitting the walls of my house or the furniture! This is why I started shooting at 10 meters.
The last pellet I tested was the RWS Hobby wadcutter. Ten went into 0.59 inches at 10 meters. But the first pellet went to the left of the next 9, so I think this might be one of those times when conditioning the bore was required for best results. Not that I believe in that theory, mind you, but this time it really looked like that’s what was happening. The 9 pellets went into 0.36 inches — a much better showing! The Hobby is the third best pellet in the test, but I think the group of 9 is more representative of what it can do.
The JSB Exact RS and the H&N Baracuda Match are the 2 pellets I’ll test at 25 yards. I would include the Hobbys, but 25 yards is right where wadcutters start to spread out, so I’ll just go with the 2 domes. However, there’s still one more thing to try today.
I removed the scope and put one plastic shim on the bottom of the rear ring under the scope tube, then installed the scope again. I went back to 10 meters without any sight-in shots and shot one more group with JSB Exact RS pellets. The group moved up over 1-1/4 inches and over to the left by a half-inch. This is where I will begin shooting at 25 yards, knowing that I’ll probably need to decrease the elevation to get back on target. Isn’t that interesting, that the point of impact moved up so much with a single shim? The shim measured 0.013 inches, by the way.
Ten JSB Exact RS pellets went into 0.244 inches at 10 meters. It’s the best group of the day! This group was fired after a 0.013-inch shim was placed between the scope and the rear ring. The scope was then simply remounted and no sight-in was done. This group is about 1.30 inches higher than the first group. It also appears to be smaller, but the dark paper hides the true size of the pellets.
Impressions so far
The Fusion is a winner! I like everything about it. It has taken some time to understand; but now that we’ve been through the design and know what to expect, you show me another air rifle that costs $170 and shoots like this one. We’re talking groups very similar to what vintage 10-meter target rifles can produce.
No — it’s not a good rifle for hunting; and, no, I don’t think it can be modified to become one. If that’s what you want, get a Discovery. Leave the Fusion as it is — a nice, quiet, accurate rifle.
25-yard testing yet to come.
by Tom Gaylord, a.k.a. B.B. Pelletier
Umarex Fusion CO2 rifle
Today, we test the Umarex Fusion CO2 rifle for velocity and several other things you readers are interested in. You may remember that in the first part I had a problem with the rifle not sealing when I loaded the CO2 cartridges. Blog reader mikeiniowa nailed the problem with the Fusion CO2 cap. The part that contains the piercing pin was partially unscrewed and was, therefore, longer than it should be. It was piercing the cartridges before the o-ring was in position to seal the gun. So, a lot of gas leaked out; and, because the o-ring absorbs CO2 and swells when it does, it also prevented the cap from being screwed down tight.
I’m going to show that cap in detail in a later report. It’s made so complex because of the material the o-ring is made from. If a different material had been used, none of the complex parts would be needed…and the cap could be made for less cost.
So, with the cap assembled correctly, I was able to load 2 fresh CO2 cartridges. This time, everything worked as it should, and the velocity test began.
JSB Exact RS
The first pellet I tried was the 7.3-grain JSB Exact RS. This lightweight dome is a winner in many lower-powered air rifles, and I believe the Fusion will be one of them. The first shots started slow, at 619, 647 and 644 f.p.s. Then, the velocity jumped up to 663 and remained above that number for the remainder of the string. The average, once the velocity was in the curve, was 667 f.p.s. That means the Fusion’s valve needs to be awakened after installing fresh cartridges.
The low velocity, once the pellet had climbed into the stable spread, was 663 f.p.s., and the high was 673 f.p.s. At the average velocity, the RS pellet produced 7.21 foot-pounds of muzzle energy. Because the Fusion is a gas gun, we can expect the power to increase and decrease with the pellet weight.
I tested the same pellet several hours later, and the first JSB RS out the spout went 686 f.p.s., so the velocity had increased by 20 f.p.s. after 40 shots had been fired and the gun then rested for 3 hours. But that was also the end of the power curve. By shot 50, the velocity of all the pellets started to drop again.
The second pellet I tried was the 7-grain RWS Hobby wadcutter. They averaged 669 f.p.s. with a spread from 661 to 681 f.p.s. At the average velocity, this pellet generated 6.96 foot-pounds of energy at the muzzle. Lighter pellet, less energy.
Crosman SSP hollowpoints
The third pellet I tested was the Crosman SSP hollowpoint. Remember, Umarex lists the velocity of the Fusion at 750 f.p.s. with lead-free pellets (which they call alloy) and 700 f.p.s. with lead pellets. I should have tested the rifle with RWS HyperMAX since those are the ones Umarex imports and distributes, but I didn’t have any on hand. Anyway, the Crosman pellets worked fine. They gave an average 766 f.p.s. velocity, with a low of 757 and a high of 783 f.p.s. At the average velocity, this 4-grain pellet produced 5.21 foot-pounds of muzzle energy, so it’s staying on track for the pellet-weight-to-velocity relationship.
After 50 shots had been fired, the average velocity for this pellet fell to 711 f.p.s. So, the velocity is going down, but the velocity is still useable up to 60 shots.
The last pellet I tried was the 10.6-grain H&N Baracuda Match. In a spring gun, the velocity for this pellet would fall off quite a bit from the numbers for these lightweight pellets, but gas guns and pneumatics are different. Heavy pellets don’t lose nearly as much velocity as they do in spring guns. The average for Baracudas was 612 f.p.s. The range went from 600 to 616 f.p.s. At the average velocity, the Baracuda produced 8.82 foot-pounds, which is significantly higher than any other pellet.
One of our readers mentioned that the total number of good shots he gets is about 70 shots with each set of CO2 cartridges. I was looking for about that number. I noticed the velocity began dropping at shot 50. But there were still 10 more good shots in the gun. From shots 56 through 60, the velocity for the baseline JSB Exact RS pellets was 622, 614, 603, 602, and 584 f.p.s. While there were still more shots to be fired, I felt that accuracy would probably drop off at this point. So, I’ll rate the Fusion I’m testing as a 60-shot gun.
And, now, we come to the question on everyone’s mind. Is the Fusion quiet? Umarex not only says that it is, they tout the low sound level heavily in their advertising campaigns. While I don’t have any scientific sound measurement equipment to test with, I can make a fairly good subjective observation of the gun’s report. I compared it to my Diana model 23, which most of you readers know to be a very small, low-powered spring-piston youth model air gun. The Fusion and the Diana 23 are approximately the same loudness. That means that the Fusion is a very quiet air rifle.
Blog reader Matt61 wondered if it would be louder than a ballpoint pen falling on a thick carpet, and I must say that it is. But it isn’t much louder. I think this is a gun you could shoot in an apartment that has thin walls separating you from the neighbors. You should be able to shoot in even small backyards without disturbing the neighborhood.
I told you the trigger is 2-stage. Stage 1 is light and relatively short. Stage 2 is also light but long and creepy. The sear releases at around 3 lbs., 12 oz.
Besides the accuracy test, which is expected, I also want to take the gun out of its stock and look for both the power adjuster and the trigger adjustment that reader mikeiniowa mentioned. I’ll use that report to also show you the details of the CO2 cap and explain how it works so you understand what’s going on.
Given the power level of the Fusion, I think I’ll start testing accuracy at 10 meters and then back up to 25 yards. If the rifle comes through the accuracy portion with honors, I’ll give it a hearty recommendation.