Buffalo Bore loads their ammunition up to maximum SAAMI specifications, which delivers devastating performance on a wide range of game. Please note that this ammunition is not intended for older guns. It is made for modern firearms only, as some of the ammunition could damage older and weaker firearms. This bullet is hard cast, properly lubed and gas checked and will not cause lead fouling in any normally functional barrel. The 500 JRH cartridge was designed by gun builder Jack Huntington to fit the Freedom Arms model 83 and other similarly sized revolvers. As such, it has nearly the same case head (.006 smaller in diameter) as the 500 S&W. With its slightly smaller case head, it will fit the tight ratchet system of the Freedom Arms model 83 and will still work great in any 500 S&W firearm. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.