Leave nothing to chance when traveling through bear country. HSM's Bear Load delivers incredible terminal performance on the biggest, angriest and most aggressive animals when it matters most. Technologically advanced powders push the premium, hard-cast bullets at significantly higher velocities for terminal energy superior to standard loads. This 45 Long Colt ammunition is for use ONLY in the Ruger Blackhawk (including the original Ruger Vaquero, pre-2005, and Ruger Bisley version of the Blackhawk), the Thompson/Center Contender, or any firearm chambered in 454 Casull or 460 S&W. It is NOT suitable for the Colt Single Action Army, Colt Cowboy, Colt Anaconda, Ruger Redhawk, Ruger New Vaquero (post-2004),Taurus Judge, any Smith & Wesson revolvers including the Governor, or vintage firearms.