i seen this too but not from in-lines as i am not sround inlines only flintlocks.most of time it was bullet i was using. maxi-hunters are terrible in my hawkins .50cal and others too. usually when i changed to right bullet, things got better. maxi-balls are best out of my hawkins, powerbelts too.so, i would say bullet you are using is problem.LENGTH of bullet is secret in most guns. my hawkins likes bullets LONG.