Hornady Handgun Hunter ammunition is built around a bullet as rough and rugged as the conditions and game demand. The MonoFlex handgun projectile is manufactured with a tough copper alloy that achieves deep penetration and 95% weight retention. Bullet expansion across a range of velocities is aided with an elastomer material added to the bullet s open cavity. Upon impact, the elastomer compresses, then pushes out and causes the bullet to expand faster than a standard hollow point design. Combined with premium cases, primers and propellants, Handgun Hunter ammunition benefits from years of producing hard-hitting GMX and MonoFlex rifle bullets to introduce a handgun version that lives up to our reputation. Product Specifications Caliber: .45 ACP Bullet Weight: 160 gr Bullet Type: MonoFlex Muzzle Velocity: Muzzle Energy: Quantity: xx Rounds per box