03-23-2020, 09:54 AM
A5 has hit the nail on the head.
It's primer flow or cratering caused by lack of support around the pin. Basically the firing pin hole is too big for the pin. Flow happen with normal loads as well as hot. The next severe step is that small circle donuts start breaking off the primers and get in everywhere to jam the action.
A thicker, stronger primer will mitigate this. A tighter hole with better tolerances from a quality manufacturer will solve it.
It's primer flow or cratering caused by lack of support around the pin. Basically the firing pin hole is too big for the pin. Flow happen with normal loads as well as hot. The next severe step is that small circle donuts start breaking off the primers and get in everywhere to jam the action.
A thicker, stronger primer will mitigate this. A tighter hole with better tolerances from a quality manufacturer will solve it.