At worst, recoil may bruise, or in the case of magnum rifle, detach the retinal laminae. Fragmentation grenades play hell with hands, eyes, brains. You can buy another gun but new fingers, eyes, forebrains aren't readily available. The proof houses and standards institutes are proving guns and setting operational limits for chamber pressure because they are concerned with preventing the latter. Someone here is speculating, implying, planting subliminal suggestions that proof houses and standard institutes want to safeguard your gun against wear. Stop that!

jack