I am mixing fired brass from two different rifles, and although I am full length resizing, could not the Savage "blow out" the case in the shoulder or head dimension that the die cannot resize, but is out of spec with the PSS?
I have an abolt that won't take full length resized brass from my RCBS dies even though those same shells fit other 7 mm mags no problem. I tryed to keep the brass separate between guns but eventually broke down and bought the RCBS small base die set and problem solved, the newly sized shells fit in every gun including mine. I've heard other people with similar problems around the 7 mm mag. I'm not sure about brass life with the small base set but it hasn't been an issue yet.