I shoot in competition @ RIO with both a carbine (S&W AR 22/Black Dog / 50 rd. drums and a BuckMark modified pistol).... I've tried almost every brand of .22 ammo made. That said, the ONLY ammo that consistently works is CCI 22 Mini Mags or CCI Blazer ammo. Both are 40 grain.... If your just plinking at tin cans or the such?.. Try the cheap stuff.... The timer is running in competition....