Underwood Ammo Xtreme Defense Features The Underwood Ammo Xtreme Defense round is engineered around an optimized nose flute total weight and velocity combination that achieves a penetration depth up to 18 inches in gelatin testing. This permanent wound cavity is over 100 percent larger in volume than any comparable expanding hollow point design on the market today. The solid copper monolithic body holds its shape and performance even after passing through intermediate barriers like wallboard sheet metal or automotive glass. At 1700 fps and 738 ft lbs of muzzle energy the 115 grain bullet is both lead free and fully supersonic for consistent terminal performance. Each round is built on new production non-corrosive boxer primed reloadable nickel-plated brass casings that resist tarnishing in storage and improve feeding reliability across handgun actions. The nickel plating process also eases cleanup during reloading and protects the brass from contact with leather moisture and other metals. With a sectional density of 0.103 the 115 grain projectile carries energy efficiently downrange for dependable self-defense performance. This ammunition is rated safe for use in a suppressor making the Underwood Ammo Xtreme Defense a versatile choice for 10mm Auto shooters who demand maximum stopping power. Underwood Ammo Xtreme Defense Specifications Manufacturer: Underwood Ammo Model: Xtreme Defense Caliber: 10mm Auto Bullet Weight: 115 gr Bullet Type: Solid Monolithic Rounds Per Box: 20 Casing Material: Nickel-Plated Brass Muzzle Velocity: 1700 fps Muzzle Energy: 738 ft lbs Sectional Density: 0.103 Application: Personal Defense Available At: GrabAGun