Underwood Ammo Handgun Ammunition Features This Underwood .357 Sig load drives a 125 grain full metal jacket bullet to 1475 feet per second producing 604 ft lbs of muzzle energy for strong terminal performance. The bullet at a diameter of 0.355 inches is built for reliable feeding and consistent penetration through its full metal jacket construction. A sectional density around 0.142 reflects how the bullet s mass is distributed to support penetration along its path. This supersonic load travels faster than the speed of sound delivering the velocity that makes .357 Sig known for flat trajectories and strong energy transfer. The nickel plated brass case resists corrosion and helps ensure smooth reliable cycling through pistols chambered in .357 Sig. Because the load is supersonic shooters running a suppressor should expect normal supersonic crack in addition to reduced report and Underwood confirms this load is safe for suppressor use. Each box contains 50 rounds giving shooters ample ammunition for training or duty use. Underwood .357 Sig 125 Grain FMJ is for sale at GrabAGun for shooters who want dependable high-velocity performance from a trusted American manufacturer. Underwood Ammo Handgun Ammunition Specifications Manufacturer: Underwood Ammo Caliber: .357 Sig Bullet Type: Full Metal Jacket Grain: 125 gr Rounds Per Box: 50 Muzzle Velocity: 1475 fps Muzzle Energy: 604 ft lbs Available At: GrabAGun