Well I have tried these a few more times, with two different rifles (both the ruger sr-22). Im convinced it is not a "break in" issue as I have run about 300 rounds through one and still having issues. Different types of ammo do make a difference but even with the best CCI round nose they still are constantly jamming. Its been about 4 months now, hopefully Hi-Cal will still return them for me the next time im in mission.