Those primers don’t show over-pressure loads AFAIC.
Cratered due to an oversized firing pin hole, yes
Exactly--and the velocities agree with those listed for the ammo, and velocity is a far more reliable indication of pressure.
Primer appearance is the most over-rated "pressure indicator" for handloaders--and has been for decades. Which is why General Julian S. Hatcher, who spent most of his U.S. Army career in various aspects of internal and external ballistics, wrote in his still very relevant 1947 book
Hatcher's Notebook, mentioned "the notoriously unreliable method of judging pressures by the appearance of the primer."
Unfortunately, Hatcher apparently believed the reasons for this were so obvious that he didn't describe the details. Which is why I did in chapter 30, "The least Reliable Pressure Indicator," of my 2020
Big Book of Gun Gack III.
Yet many handloaders still believe in primer appearance--and even a few handloading manuals still include it.
