Winchester PDX1 Defender Features 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. Winchester PDX1 Defender Specifications Manufacturer: Winchester Model: PDX1 Defender Caliber: 9mm Luger +P Bullet Weight: 124 gr Rounds Per Box: 20 Casing Material: Nickel-Plated Brass Application: Personal Defense Bullet Type: Bonded Jacket Hollow Point Muzzle Energy: 396 ft lbs Muzzle Velocity: 1200 fps Rating: +P