I have read that the P22's are pretty selective about what ammo they will tolerate. After reading on the message boards about these pistols, I bought a bunch of Remington Thunderbolt ammo. When I went to the range yesterday to try my new pistol out for the first time, things started out fine. I started with Stinger ammo, then went to the Thunderbolt. When I switched to the Thunderbolt, I notice the holes in the target started getting bigger, clearly the bullet was tumbling. Anyone experience this? The kid at the range said he thouight it was hte ammo, but some of hte Stinger tumbled later in the session as well. There was some buildup on the muzzle, but I am not sure that influenced things.