The Underwood Ammo Xtreme Defense 45 ACP features a cutting-edge 135-grain solid monolithic projectile delivering exceptional performance with 1335 FPS muzzle velocity and 534 ft-lbs muzzle energy.Underwood Ammo Xtreme Defense 45 ACP ammunition135-grain solid monolithic projectile for superior penetration and expansionHigh-velocity performance: 1335 FPS muzzle velocityPowerful 534 ft-lbs muzzle energyPremium nickel-plated brass casing for reliable feeding and ejection20 rounds per box packagingEngineered for self-defense and tactical applications this premium ammunition combines advanced projectile technology with consistent reliable performance for discerning shooters who demand excellence.