One thing I can say: I have never heard this problem mentioned in Germanyicon. Maybe because our rifles have been proofed before being offered on the civilian market, and we trust that the proof houses know the difference between maximum and average, copper-crushing and piezo measurements etc. We just happily stuff commerical .308 WIN ammo and NATO ammo into our proofed rifles and do not appear to have any problems. And most milsurp shooters will avoid loading their rifles to the maximum pressure anyway.