Some times you get away with it sometimes you dont.
I had a batch of improperly formed 30-30 to 7-30 cases. First shot popped my contender open and ejected the back 1/2" of case. Last time I ignored the difference between closing, and closing without resistance (I undersized the brass as i would when fire forming bolt gun rounds). Had the pressure not dropped by the time that case separated it likely wouldn't have been a learning moment.
The only other larger case separation/blow out was in an autoloading hand gun. Again neither event caused me damage, but they aren't something one wants to have happen regularly.
My 10/22 in .17m2 would lose a case rim about once every box, again mostly comical as it usually blew the magazine out with no other damage, but again clear sign ones doing something they shouldnt......
I had a batch of improperly formed 30-30 to 7-30 cases. First shot popped my contender open and ejected the back 1/2" of case. Last time I ignored the difference between closing, and closing without resistance (I undersized the brass as i would when fire forming bolt gun rounds). Had the pressure not dropped by the time that case separated it likely wouldn't have been a learning moment.
The only other larger case separation/blow out was in an autoloading hand gun. Again neither event caused me damage, but they aren't something one wants to have happen regularly.
My 10/22 in .17m2 would lose a case rim about once every box, again mostly comical as it usually blew the magazine out with no other damage, but again clear sign ones doing something they shouldnt......