Crosman 1088 - Part 2
by B.B. Pelletier
Before I begin, here's an update on the Career Infinity. I wanted to test velocity for you today, but when I picked up the rifle it had leaked off a little, so I topped it off with the scuba tank. When I bled the line to disconnect from the tank, the inlet valve stuck open and exhausted all the air again. This was the same problem the rifle had before and fixed in the last report.
I called Boris at Pyramyd Air, and we talked about the problem a bit. Boris told me he has seen this happen a couple times. What's happening is that the inlet valve isn't returning to the exact spot it was before it opened, so a small passageway remains open for air to escape. The soft valve material allows that to occur. He thinks a Teflon valve may solve the problem because it would be lighter than the brass valve body that's in the gun now, plus Teflon conforms to almost any surface with a minimum of fuss. He's getting a new Teflon valve out to me. I will let you know how well it works when I get it installed.
Today, we'll look at how the Crosman 1088 pistol performs for velocity. The temperature outside is 27 degrees F, but in my office it's a toasty 70 degrees.
The first discovery is that it's best to remove both grip panels to load a CO2 cartridge. You need to gain access to the screw key, and the grip panels get in the way. Yes, I applied Crosman Pellgunoil before piercing the cartridge.
I think I discovered why owners are tightening their cartridges too tight and causing leaks after a while. This gun loads silently. You cannot hear the gas rushing in. I finally stopped when I knew I had turned the key enough (really too much) and sure enough there was gas in the gun. For some reason, this is a quiet gun. Probably due to a new seal at the piercing pin. At any rate--watch it!
Crosman Silver Eagles
Let's get the speed-demon pellets out of the way. Crosman Silver Eagles went an average of 440 f.p.s. in double-action and 410 in single-action. The pellets I used were not the hollowpoints that weigh 0.2 grains less, so there might still be more velocity in the gun.
Somebody asked me to try Beeman Kodiaks for accuracy in this pistol, so I also clocked them. They averaged 291 f.p.s. in double-action with a spread from 283 to 306. Single-action was 277.
At this point, I discovered that the 1088 does not like to be fired single-action. At least the test gun doesn't. The hammer is only for firing. When you cock it, the clip doesn't advance to the next chamber. Only the trigger advances the clip. Several times the hammer released before the clip rotated, and I either shot a blank or I tied up the gun's action. I have to recommend you don't shoot it any way but by pulling the trigger. The Crosman website states the gun can be shot DA or SA, but the manual states that you fire the gun by pulling the trigger and does not mention cocking it with the hammer. We've emailed Crosman to get the facts on this. I'll update you when I find out.
RWS Diabiolo Basics
RWS Diabolo Basic pellets averaged 324 f.p.s. They ranged from 317 to 328.
Benjamin Sheridan Diabolo domes
Benjamin Sheridan Diabolo domes (7.9-grains.) went from 353 to 322. They score an average of 335 f.p.s. That's odd, since they're nearly a full grain heavier than the Basics that went 11 f.p.s. slower, but that's what happened.
The 1088 is also a BB gun, and, as a reader pointed out to me in the first report, a magnet holds the Crosman Copperhead BBs in the clip instead of the ridges down the inside of the chambers that I mentioned in my report. The BBs averaged 368 f.p.s. and ranged from 388 down to 348. However, they exhibited the same drop in velocity, shot after shot, that the pellet did. When shooting the BBs, I took pains to allow only five seconds between shots. Here's what that looks like:
Then, I waited a full minute before shooting the last shot.
The velocity drops with every shot when a five-second interval is used between shots. That means this gun is very sensitive to temperature. So for accuracy, wait at least 15 second between shots. It'll probably still hit pop cans at 20 feet when fired fast, but the groups will open on paper.
There seem to be 50-60 good shots per cartridge, which is about what we expect for this kind of performance. There are many lower-powered shots after that, so you need to be mindful of stopping before you jam the gun.
Remember what I said about not tightening the cartridge too much when you pierce it. I think that will prevent the leaks some shooters report after owning the gun for a while.