Sure you could Otto and that should work admirably, if headspacing on the shoulder is why the action won't close.

This is more question than comment, but, when reforming A-base brass from 45-70 or other parent cases, isn't the rim....bent(?) or formed....forward, towards the case mouth? Is that what the die and punch being discussed are for?

NRA Benefactor 2008
NRA Patron 2007
NRA Endowment 1996
NRA Life 1988