Engineered to maximize terminal ballistics as defined by FBI test protocol, PDX1 Defender ammunition provides maximum stopping power for the ultimate in personal defense. Our innovative bonding process welds the jacket to lead core for improved penetration, 1.5x expansion, and the proven performance you rely on when the stakes are high. Brand: Winchester Ammo Category: Centerfire Handgun Rounds Model: Defender Caliber: 40 S&W Rounds Per Box: 20 Muzzle Energy: 476 ft lbs Muzzle Velocity: 1140 fps Application: Home Defense Boxes Per Case: 10 Bullet Type: Bonded Jacket Hollow Point Bullet Weight: 180 gr