Underwood Xtreme Defender 10mm Auto Ammunition: Uncompromising Hunting and Self-Defense Performance Underwood Ammo's Xtreme Defender 10mm Auto ammunition delivers exceptional ballistic performance and terminal effects for both hunting and personal defense applications. Featuring a 115-grain solid copper bullet, this cartridge achieves a muzzle velocity of 1,700 feet per second, generating 738 foot-pounds of muzzle energy. Solid copper bullet construction for maximum penetration and weight retention Supersonic muzzle velocity for a flatter trajectory and faster target engagement Nickel-plated brass cases for reliable function and corrosion resistance Proven effectiveness for hunting medium-sized game and personal protection The Xtreme Defender's high sectional density of 0.102678571428571 and ballistic coefficient ensure the bullet maintains stability and penetration downrange. This ammunition is also suppressor-safe, making it a versatile choice for a variety of shooting applications. Whether you're hunting in the field or defending your home, Underwood's Xtreme Defender 10mm Auto ammunition delivers the power, accuracy, and reliability you demand.