Engineered to maximize terminal ballistics as defined by FBI test protocol, Defender ammunition provides maximum stopping power for the ultimate in personal defense. Winchester's innovative bonding process welds the jacket to lead core for improved penetration, 1.5 x expansion and the proven performance you rely on when the stakes are high. Series Defense Caliber 40 S&W Application Home Defense Bullet Type Bonded Jacket Hollow Point Bullet Weight 180 gr Muzzle Energy 476 ft lbs Boxes Per Case 10 Rounds Per Box 20 Casing Material Nickel-Plated Brass Muzzle Velocity 1140 fps Unit Of Measure box