Just an off the wall comment but back in 1981 I bought a Remington M700 BDL in 30-06. I don't are what was shot in the gun, i got cratered primers. Even my gallery loasds for plimnking and small gae (110 gr. cast bullet over 5.0 gr. of Unique) cratered primers. On close imspection, some yahoo at the Remington factory must have chamfered the firing pin hole a tad to get rid of a burr or something.
I just ignore the craters and use other signs to determine pressure.
Paul B.