Processed .357 Magnum Pistol Brass Headstamps Are Mixed Fully Processed, Ready To Load Deprimed, Resized, and Polished 100% Brass Casings 500+ Casings Shop 357 Magnum processed brass for reloading. Our fired and processed .357 Mag brass casings are cleaned, deprimed, and resized. Add a Unis Ginex small pistol primer, powder, and a Capital Cartridge 158gr bullet to build your custom load. We have .357 Magnum processed reloading brass at competitive prices-ideal for both beginners and experienced reloaders. Available in bulk quantities