Atlanta Arms 458 SOCOM 350gr FMJ Ammo – 20 ct Box

Brand new Atlanta Arms 458 SOCOM 350gr FMJ Ammo – 20 Round Box The .458 SOCOM is a powerful big-bore cartridge developed in the early 2000s specifically for the AR-15 platform, delivering the hard-hitting performance of the legendary .45-70 Government in a modern, lightweight semi-automatic rifle. By simply swapping the upper receiver (barrel and bolt), it transforms a standard AR-15 into a formidable short- to medium-range powerhouse capable of launching heavy .458-caliber bullets weighing 250 to 600 grains. A typical 300-grain load achieves velocities around 1,800–1,900 fps, generating over 2,400 ft-lbs of muzzle energy—ideal for devastating terminal ballistics and one-shot stops.