Winchester's S40SWPDB Defender 40 S&W ammunition is designed for personal defense. Engineered to maximize terminal ballistics, this ammunition provides maximum stopping power. The innovative bonding process welds the jacket to lead core for improved penetration and expansion. This ammunition is ideal for those who require a reliable and effective self-defense round. With its nickel-plated casing, it's built to withstand the rigors of repeated use. Fast shipping ensures that you can get this ammunition when you need it most. Whether you're a seasoned shooter or just starting out, Winchester's Defender ammunition is a great choice for personal defense. Key Benefits and Features: Caliber: 40 S&W. Bullet Type: Bonded Jacket Hollow Point. Muzzle Velocity: 1140 fps. Muzzle Energy: 476 ft-lbs. Rounds Per Box: 20. Casing Material: Nickel-Plated.