I've noticed the regular large rifle primers really getting hammered in my sporterized swede 50 cal rolling block rifles. I'm pretty sure it is the protrusion length and possibly the shape of the firing pin. Also it might be that the original primers that were used in these old military rolling blocks had a very different type of metal and a thicker/harder material. I haven't had any pierced primers yet, but I would like very much not to have one in the future either. I have been thinking of trying some of the CCI #34 primers I have that I use in the sks ammo. Anyone else come across this type of issue, and if so what did you do?