So, in the past weeks ive seen several posts where primers have pin holed and really cut up some bolt faces.
What I don't get is how come with a partial case head separation or even just plain normal shooting doesn't absolutely cut up the chamber walls? Obviously gotta be the amount of heat or time of burn but I just don't get the big damage on one hand and not the other? So...what forces are at play for the big diff?

Last edited by kraky111; 09/16/14.