Quote:Mine will do it if the bolt isn't completely closed.
Yeah, that's how they headspace on a blow-back. Make sure the bolt face and breech are clean and not holding the bolt from seating tight. If there's slop, the firing pin will drive the case forward to take up the slack, instead of crushing the rim.
I bet somebody in the Marlin forum on Rimfirecentral could give you some good troubleshooting tips.