Colt Defense .357 Mag Features This tough heavy bullet will penetrate deep and still create a large wound channel due to its high sectional density high velocity and spectacular bullet. Perfect for when more penetration is needed. This is a very good loading for hiking hunting and camping. Very low muzzle flash and velocity is from a 4 inches bbl. From a 6 inches bbl average velocity is 1520 fps. Colt Defense .357 Mag Specifications MFR:357M158CT UPC:753387048454 Caliber:.357 Magnum Type:Jacketed Hollow Point Model:Colt Defense Grain Weight:158Gr Muzzle Energy:688 ft lbs Muzzle Velocity:1540 fps Rounds per Box:20 Rounds per Case:1000