by Tom Gaylord
Writing as B.B. Pelletier
This report covers:
- Nomad air compressor
- The test
- JSB Exact Jumbo
- RWS Superdome
- Hades pellet
- Is the JSB Jumbo more accurate?
Today we begin testing the Ataman BP17 PCP bullpup air rifle for accuracy. Today’s test will be at 25 yards . Before I could do that, though, I had to mount a sight.
Nomad air compressor
I tried to fill the rifle and found that my largest 98 cubic-foot carbon fiber air tank would only fill to 3,800 psi. The smaller 88 cubic-foot tank has even less air at this time, but fortunately I had left the Nomad II compressor hooked up. It only took a minute to attach to the rifle and finish the fill to 300 bar (4,350 psi). I’m starting to really appreciate that Nomad compressor for its convenience!
I shot all targets from a bench at 25 yards with the rifle rested on a sandbag. I used a rear bag to steady the rifle even more.
I decided to shoot 7-shot groups since that’s what the magazine holds.
I sighted in the rifle with the first 7 shots. I made certain the groups would be below the aim point because this Ataman has a reputation for pinpoint accuracy and I didn’t want to blow away my reference point.
JSB Exact Jumbo
The first pellet I tested was the .22 caliber JSB Exact Jumbo that Tyler Patner had tested in his video. He shot 7 shots at 45 yards and I was shooting at 25 yards, so my groups promised to be a little smaller. Seven pellets from the test rifle went into 0.237-inches at 25 yards. That’s a tight little group! Tyler put 7 of the same pellets into 0.38-inches at 45 yards.
The super-light trigger was no problem for this test because the rifle was benchrested. But I would still like the trigger to have a precise second stage.
JSB Exact Monster
The second pellet I tried was the heavyweight JSB Exact Monster. You will remember that this was the pellet that generated the most power in Part 2. I could hear these pellets going noticeably slower than the ones before, and they landed even lower on the target. Seven of these pellets went into 0.384-inches at 25 yards — another good group! Tyler didn’t mention testing this pellet in his review.
Next I tested 7 RWS Superdome pellets. I thought they would strike the target about where the first pellets had or perhaps even higher since they are lighter, but they didn’t. In fact they landed so low that parts of the lowest pellet holes are off the target paper. So, I measured this group with the target still taped to the backer board, to get the exact size. Seven Superdomes went into 0.545-inches between centers at 25 yards. Since the JSB pellets are so accurate, I don’t believe I will shoot Superdomes in this rifle anymore.
The last pellet I tested was the JSB Hades pellet that has proven to be so accurate. It weighs the same as the JSB Jumbo pellet, so I expected it to shoot the same or better. But it didn’t.
This pellet also landed so low that I had to measure the group with the target still attached to the backer board. Seven Hades pellets made a 0.47-inch group at 25 yards. That’s not bad, but the Jumbo pellet I shot at the first target was more accurate.
Is the JSB Jumbo more accurate?
After shooting the Hades group I wondered if the JSB Jumbo pellet really was more accurate, or was I perhaps getting tired at this point in the test? So I shot a final 7-shot group with the JSB Jumbo. This time 7 pellets went into 0.295-inches at 25 yards. That is a little larger than the first group. but it’s also smaller than the Hades group. So it appears in this BP17, the Jumbo pellet shoots better than the Hades pellet.
I think it’s pretty clear that of the 4 pellets I tested in the BP17 so far, the JSB Jumbos are the most accurate.
The rifle handled well and had no failures to feed. I did remove the clip with one pellet left inside twice (can’t count to 7 I guess), but all I had to do was insert it again and pull the cocking lever forward 8 times. The pellet is guaranteed to be in the breech if you do that. Don’t do it with more than a single pellet left in the clip.
The rifle holds pretty well for a bullpup. Bullpups aren’t my favorite rifles to shoot because they are too easy to cant, but with concentration you can get past that.
The Ataman BP17 is performing like it should. It isn’t as picky about pellets as some PCPs, but it does favor some pellets over others. The Lothar Walther barrel gives it an overall good chance for success.
I thought the 300-bar fill would be a problem, but since I have the Nomad II compressor available, it’s a breeze. I think I will keep the compressor up and running as we head into the 50-yard test that comes next. That will be outdoors, and because the Nomad II works off a car battery, too, I think I will go on using it.