Underwood Ammo Handgun Ammunition Features Underwood Ammo Handgun Ammunition in .357 Sig is built around a 147 grain jacketed hollow point bullet designed to expand reliably on impact for serious self defense applications. At a muzzle velocity of 1250 feet per second this load stays supersonic throughout its effective range and generates 510 ft lbs of muzzle energy giving it the penetration and expansion characteristics that defensive shooters look for. The bullet s sectional density of roughly 0.167 helps it maintain momentum through barriers common in self defense encounters translating into deeper more consistent penetration. Each case is made from nickel plated brass which resists corrosion during storage and feeds smoothly through semi-automatic pistol actions. This load is rated safe for use with a suppressor giving shooters flexibility for training or home defense setups that include sound suppression. Packaged 20 rounds per box this ammunition suits range practice as well as carry duty in a .357 Sig pistol. For shooters seeking dependable proven self defense performance this Underwood Ammo load is available for sale at GrabAGun. Underwood Ammo Handgun Ammunition Specifications Manufacturer: Underwood Ammo Caliber: .357 Sig Bullet Type: Jacketed Hollow Point Bullet Weight: 147 Grain Muzzle Velocity: 1250 fps Muzzle Energy: 510 ft lbs Rounds Per Box: 20 Case Material: Nickel Plated Brass Available At: GrabAGun