The 44 Magnum +P+ Ammunition by Buffalo Bore Ammunition brings a level of power to the 44 Magnum that was never before known, and it is designed for specific firearms ONLY. This ammunition is compatible with the following handguns: Ruger Red Hawk, Ruger Super Red Hawk, Ruger Super Blackhawk, Ruger Vaquero, Freedom Arms Model 83, Taurus Raging Bull, Colt Anaconda, and Dan Wesson Revolvers. This ammunition is also compatible with the following rifles: T/C Encore, Winchester 1894, Handi Rifle, any rifle with a falling block action, and a MODIFIED Marlin 1894 (re-barreled with a twist rate of roughly 1:20"). This compatibility list is all-inclusive.