Underwood Ammo Xtreme Defense Features The Underwood Ammo Xtreme Defense round based on the Xtreme Penetrator product line is built with an optimized nose flute total weight and velocity combination to achieve a penetration depth up to 18 inches. No other expanding hollow point design comes close to generating a permanent wound cavity of this diameter and volume with Underwood reporting a wound cavity more than 100 percent larger than other expanding bullets. Critically this expansion is achieved even when the bullet is fired through common barriers since the solid copper body is not disrupted by wallboard sheet metal or automotive glass the way a traditional jacketed hollow point can be. At 1240 feet per second and 461 foot pounds of muzzle energy the 135 grain .45 ACP load delivers serious terminal performance in a compact pistol caliber. Each case is nickel plated brass a process that improves feeding reliability across different pistol actions while offering enhanced corrosion resistance compared to traditional brass. Nickel plated cases also resist tarnishing during long term storage or when they come into contact with leather moisture or other metals in a carry setup. Being lead free the bullet is also safe to fire through a suppressor. Packaged 20 rounds to a box this Underwood Ammo Xtreme Defense .45 ACP load is for sale at GrabAGun for shooters who want a dependable deep penetrating self defense round. Underwood Ammo Xtreme Defense Specifications Manufacturer: Underwood Ammo Model: Xtreme Defense Caliber: .45 ACP Bullet Weight: 135 Grain Bullet Type: Solid Monolithic Muzzle Velocity: 1240 fps Muzzle Energy: 461 ft lbs Case Material: Nickel-Plated Brass Rounds Per Box: 20 Lead Free: Yes Available At: GrabAGun