Winchester WinClean ammuition features a patented lead and heavy metal free primers brass enclosed base bullets and clean burning propellants not only eliminate airborne lead at the firing point they also generate less barrel action and shell case residue. – Caliber: 45 Automatic Colt Pistol – Bullet Type: Winclean Brass Enclosed Base – Bullet Weight: 230 gr – Muzzle Energy: 356 ft / lbs – Muzzle Velocity: 835 fps – Rounds Per Box: 50