Underwood Ammo Rifle Ammunition Features Underwood Ammo builds this .458 SOCOM load around a substantial 500 grain lead flat nose bullet delivering significant mass and energy transfer for heavy-hitting performance downrange. The subsonic velocity of approximately 1070 feet per second keeps this round below the sound barrier which is the key requirement for quiet efficient operation through a suppressor without the supersonic crack that otherwise accompanies most rifle ammunition. The flat nose bullet profile is designed for reliable feeding in AR-platform rifles chambered in .458 SOCOM while still delivering strong terminal performance on impact. This combination of heavy bullet weight and controlled subsonic velocity makes the round well suited to short range hunting and suppressed shooting applications alike. Each box contains 20 rounds a practical quantity for range testing zeroing a suppressed rifle or taking into the field for a hunting outing. Underwood Ammo is known for loading ammunition at the upper end of safe pressure and velocity specifications and this subsonic .458 SOCOM round reflects that same attention to consistent high quality loading. The .458 SOCOM cartridge itself was designed to deliver big bore stopping power from an AR-15 pattern rifle and this subsonic loading extends that capability into suppressed use. This load is a strong choice for hunters and suppressed rifle shooters who want heavy bullet performance without sacrificing sound reduction. Underwood Ammo Rifle Ammunition Specifications Manufacturer: Underwood Ammo Caliber: .458 SOCOM Bullet Weight: 500 Grain Bullet Type: Lead Flat Nose Muzzle Velocity: 1070 fps Rounds Per Box: 20 Available At: GrabAGun