I worked for and around Government facilities for 30 + years. The Safety factor figured in for anything that can or could, maybe cause harm too someone or something is astronomical . H Even the PEL limits (Permissible Exposure Level) on lead are at a very low limit . I’m sure there’s a lot of wiggle room in the established pressures in guns, as far as what is Safe & considered a max. load. How is pressure measured in a gun barrel? Do they tap the barrel and install a gauge?