Capt RB
Well-Known Member
- Joined
- Dec 1, 2014
- Messages
- 1,994
Small primers mean a smaller hole in the case head. Primary advantage of a sp case is being able to run higher pressure as well as better es and sd. If you run a standard firing pin .074 vs a .062 pin your exposing more of the softest part of the case head. This can show pressure sooner and also cause the primer pocket to be subjected more growth due to flow of the primer because it isn't supported as well. Accuracy can be as good with either size. The only thing that would be an advantage would be a lighter pin would create a faster lock time. There are lots of articles written by people far more qualified than I am on this subject. I'm just parroting what i have read and witnessed. When I shot a 222 it had a standard pin. When we put a speedlock set up in it .062 it shot better. That was a small pin we had to bush. We did the same for a 6mm ppc that already had a small pin. The biggest thing was bushing the pin so it was supported.How does the firing pin affect accuracy or case life?