Underwood Ammo .45 ACP +P 255 Grain Coated Hard Cast Nickel Plated Brass Cased Pistol Ammo 20 Rounds. Specifications for Underwood Ammo .45 ACP +P 255 Grain Coated Hard Cast Nickel Plated Brass Cased Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: .45 ACP +P Number of Rounds: 20 Bullet Type: Hard Cast Flat Nose (HCFN) Bullet Weight: 255 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 925 ft/s Muzzle Energy: 485 ft-lbs Application: Target Package Type: Box Primer Style: Centerfire Sectional Density: 0.18 Lead Free: No Features of Underwood Ammo .45 ACP +P 255 Grain Hard Cast Flat Nose Hi-Tek Coated Nickel Plated Brass Cased Centerfire Pistol Ammunition This ammo is a proven round for hunting. This round is designed to be subsonic and travels slower than the speed of sound. This product has been designed to be an effective choice for the ultimate in self-defense applications. The bullet in this product has a Sectional Density (SD) of 0.17830571808957. SD is the ratio of an object's mass to its cross sectional area with respect to a given axis. It conveys how well an object's mass is distributed (by its shape) to overcome resistance along that axis. This ammo IS SAFE to use in a suppressor. The bullet in this ammo has a ballistic coefficient (G1) of - Generally the higher the coefficient the more stable the projectile will be in flight. Package Contents: Underwood Ammo .45 ACP +P 255 Grain Coated Hard Cast Nickel Plated Brass Cased Pistol Ammo Underwood Ammo 727: .45 ACP +P 255 Grain Coated Hard Cast Nickel Plated Brass Cased Pistol Ammo 20 Rounds