Buffalo Bore loads their ammunition up to maximum SAAMI specifications, which delivers devastating performance on a wide range of game. Please note that this ammunition is safe to use in older prewar revolvers in proper working condition. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

Owner of Buffalo Bore Tim Sundles on Heavy 45 Auto Rim Ammunition:

You’ve been asking for a couple heavy 45 AUTO RIM standard pressure loads, so by popular demand, here they are. Both of these loads utilize high quality Starline brass. We’ve also incorporated flash suppressed powder so you can shoot in the dark without blinding yourself and this is important because over 95% of all civilian shootings in the USA occur in low light when the criminal element is at work. Both of these loads are the ballistic equivalent of +P 45 ACP loads, yet they operate at standard 45 ACP pressures. These loads are safe to use in ANY 45 ACP revolver that is in normal operating condition, including ANY model 1917 Colt or S&W revolver.

Check out the below velocities fired from personal real world revolvers, NOT test barrels. You’ll notice that the new S&W 4 inch MT Gun gives velocities almost as fast as the older S&W revolvers with 5.5 inch and 6.5 inch barrels. This is not a typo. It simply shows that the new S&W revolvers are made to much tighter tolerances than the older S&W revolvers and therefore give higher velocities per inch of barrel.

Item # 31B – 200gr. Jacketed Hollow Point bullet S&W Mountain Gun, 4 inch bbl = 1033 FPSS&W Model 325 (scandium) 2.5 inch bbl = 950 FPSS&W Model 1917 (1937 production) 5.5 inch bbl = 1046 FPSS&W 1955 Target (25-2) 6.5 inch bbl = 1063 FPS

Item # 31A was designed for expansion and massive terminal damage, with about 1/2 of the penetration of item # 31B. Expect about 14 inches of penetration.