These cartridges are loaded with a lighter projectile then conventional 9mm Luger ammunition for use in pistols and revolvers. They may not function reliably in all models of firearms. DO NOT RELOAD THESE CARTRIDGE CASES. These cartridge cases are marked NR (Not Reloadable). Rupture of reloaded cases can cause severe injury. Do not use shotshells in firearms with ported barrels or ported recoil compensators. Cylinder lock up may occur in light weight revolvers due to capsule movement resulting from recoil inertia.