Buffalo Bore Ammunition Outdoorsman 45 ACP +P 255 Gr Hard Cast Flat. However the greater pressures and power of the +P ammo will give greater slide velocity. Specifications for Buffalo Bore Ammunition 45-255/20 Outdoorsman 45 ACP +P 255 Gr Hard Cast Flat N: Manufacturer: Buffalo Bore Ammunition Caliber: .45 ACP Number of Rounds: 20 Bullet Type: Hard Cast Flat Nose (HCFN) Bullet Weight: 255 grain Cartridge Case Material: Brass Muzzle Velocity: 925 ft/s Application: Protection Primer Style: Centerfire What is Buffalo Bore Ammunition 45-255/20 Outdoorsman 45 ACP +P 255 Gr Hard Cast Flat N good for? The manufacturer suggests that it is best for protection.