The Buffalo Bore Ammunition 31B/20 is a high-quality 45 Auto Rim standard pressure load. It\'s crafted with superior Starline brass and equipped with flash-suppressed powder for comfortable night shooting without self-blinding. It bears the ballistic abilities equivalent to that of +P 45 ACP loads, but operates at standard 45 ACP pressures. These loads are safely compatible with any 45 ACP revolver that is in normal operating condition. This includes any model of 1917 Colt or S&W revolver. Experience the perfect balance between great performance and safety with the Buffalo Bore Ammunition 31B/20.