Using a Keith-style SWC hardcast bullet, this loading makes your .45 Colt a very effective hunting weapon. These loads are safe in newer model Ruger Blackhawk and Redhawk, TC Contender, BFR revolvers, Colt Anaconda, and Freedom Arms firearms. These loads are safe in all modern Model 1892 lever guns as well as all Winchester & Marlin 1894's. DO NOT USE IN ANY OTHER FIREARM. THESE ARE NOT STANDARD PRESSURE CARTRIDGES! Operating at 27,500PSI