Buffalo Bore Ammunition Pistol 45 Auto Rim +P 255 Gr Hard Cast Flat Nose. Both of these loads are the equivalent of +P+ 45 ACP ammo also known as 45 Super. These are very stout loads but will not harm modern 45 ACP revolvers nor will these loads harm any post-war 45 ACP revolvers. Feel free to safely shoot these loads in any post war 45 ACP revolver in normal good operating condition. Specifications for Buffalo Bore Ammunition 32A/20 Pistol 45 Auto Rim +P 255 Gr Hard Cast Flat Nose: Manufacturer: Buffalo Bore Ammunition Caliber: .45 Auto Rim Number of Rounds: 20 Bullet Type: Hard Cast Flat Nose (HCFN) Bullet Weight: 255 grain Cartridge Case Material: Brass Muzzle Velocity: 1000 ft/s Application: Protection Primer Style: Centerfire What is Buffalo Bore Ammunition 32A/20 Pistol 45 Auto Rim +P 255 Gr Hard Cast Flat Nose good for? The manufacturer suggests that it is suitable for protection.