Does anyone have experience with these conversions? I've tried Federal AutoMatch Target .22, which, in mine will not cycle the .22 conversion. I've tried CCI Stingers. They do cycle well, but they're fairly high velocity. I'm kinda worried about burning out the barrel. I've heard from onr guy CCI Mini Mags work; but, from what I've read, they have about the same ballistics as the Federal Automatch Target. Any ideas?