I managed to find some time this morning before the wind picked up.
I had dumped two mags last night just for giggles, and I used ten shots this morning to zero the rifle with Alcock & Pierce Pro-Pel pellets.
Then off front and rear bags, at 12.5m, I shot a 10-shot group at 31mm, then five shots into 27mm, and 9.5mm, which surprised me after fifty shots on the CO2 canisters. Then I tried one 10-shot single-action group at 23mm, then back to double-action ten shots in 25mm, then 37.5mm, and finally shots 81-90 went into a group that was only 8.5mm wide, but stretched 59mm down the page, the last shot being around 90mm low. Many of the last forty pellets bounced off the wood back to where I was sitting. I probably could've fired another ten or twenty, but velocities would've been so low as to no longer be on the paper...at 12.5m. I would say a good 75 shots though are decent enough for plinking small targets, with perhaps 20mm of elevation drop from full charges. With a little practice to learn the holdover as the CO2 runs out, I think 100 shots is not out of the question.
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I popped in a pair of fresh cartridges, and switched to H&N Field Target Trophy's, putting five single-action into 14mm, then double-action into 21mm, 24mm and 10.5mm. Then I set up the phone to record a mag dump and dumped ten rapidly into 18.5mm in 3.5 seconds - wow!
https://www.youtube.com/watch?v=aBpIScKUVjgFollowed by two ten-shot groups of 18mm to finish off. I didn't see any reason to test the more exotic pellets once I'd confirmed this would not be a hunting rifle, the groups are already fine for plinking tenth-scale silhouettes. I did have a target set up at 25m as well, but the wind was really coming in and I didn't see any value in trying to shoot more groups in it. With 160 pellets down the tube, I stopped to do a bit with the Crosman before the wind got too horrendous.
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Even with full cartridges I would not consider this to have enough power for humane hunting of pests beyond about 15m at most. It is significantly, and noticeably quieter than the Crosman Slayer though, so might be useful for clearing rats out of the hay sheds.
I worked out early on that the trigger pull is hugely dependent on having the pellets seated fully in the magazine, any high ones drag heavily, possibly heavy enough to damage the hand or the plastic teeth. Between gloves or frozen fingers I found the best way was to seat them using the base of a gas cartridge. Then spin it in the magazine to ensure it spins freely before putting it into the rifle. If the mag won't seat easily, don't force it. Remove it and check that the centre pin is fully forward, if not it won't seat. I didn't bother much with the single-action, mainly because the charging handle was just under the windage turret, and shooting rested didn't seem to be suffering too much with the trigger pull. In the field I would think single-action would be more beneficial.
A carton of fifty 12gm CO2 cartridges cost me $82 delivered, but should be good for at least 1800 shots, so about five-cents per shot on top of the pellets. The pellets I'm using are 3-5 cents apiece, although there are far more expensive options. So it costs me roughly the same as shooting CCI Std Vel .22LR ammo.
While I like the rifle, I'm hesitant to recommend it, as I think much of my enjoyment might just be nostalgia for my childhood 10/22 rifle. It's fun to shoot, decently accurate, very quiet, fairly cheap, and probably a great choice to teach youngsters about shooting, if that were still legal in most states. It is neat being able to do semi-auto mag dumps again too
As the gas bleeds off, you _will_ have pellets coming back at you, so wear eye protection. I would also recommend paper targets hung in a frame (ideally in front of a pellet trap) rather than stuck to any kind of back board, some of the later shots barely made bullet holes in the paper, they look more like they split the paper and pushed through.
Trying to fill the magazine with tiny pellets in cold weather sucks though. And it is annoying that the gas pressure drops off as you shoot it. There's a stage where you have to decide whether to shoot some more with very little pressure, or dry-fire the remaining gas off and swap in some fresh cartridges. I could see where it'd be useful to have some cans or something set up off to the side to expend those last low-velocity shots on rather than just waste the gas. It's also an annoyance having to use up the gas during a session, although I'm really not sure what the ramifications are from leaving it in the safe for a week with gas remaining in it.