Winchester Defender 357 Magnum 125gr Bonded JHP Handgun Ammo - 20 Rounds - Engineered to maximize terminal ballistics as defined by the FBI test protocol, Defender centerfire handgun ammunition provides maximum stopping power for the ultimate performance in personal defense. The innovative and proprietary Winchester bonding process welds the jacket to the lead core for improved penetration, 1.5x expansion and the proven performance needed when the stakes are high. The load also includes a notched jacket, which is preprogrammed to expand into six uniform segments for consistent tactical performance. Features Consistent Performance - Notched hollow point is designed to expand up to 1.5x the original diameter; Improved Penetration - Proprietary bonding process welds jackets to lead; Maximum Stopping Power - Rugged bullet design penetrates deep with massive energy transfer;