450 BUSHMASTER AMMO - 360 gr. HC FN GC (1.700 fps/ME 2,310 ft. lbs.) - 20 Round Box FREE SHIPPING - Purchase 12 or more boxes & get FREE SHIPPING! (Retail Sales Only). 223 Remington Centerfire Rifle Ammunition Introduced in 1964, the 223 Remington is the civilian version of the 5.56x45mm NATO cartridge. Although very similar to the 222 Remington it has a slightly longer case and a shorter neck, giving it greater powder capacity and thus higher velocity--which was necessary to meet military penetration requirements at longer range. Surplus Ammo sells high-quality ammunition for affordable prices. Shop today! Surplus Ammo offers Armscor, Sellier & Bellot, S&B, Winchester, CCI, Federal, Remington, Magtech, PMC, Hornady, Black Hills & our own SAA Ammunition.Able Ammo specializes in discount hunting supplies, shooting supplies, hunting firearms, discount ammunition, guns for sale, hunting optics, hunting knives, hunting & outdoor clothing, reloading supplies, black powder hunting supplies, and tons of gun accessories like gun cases, gun safes, holsters, grips, magazines and more.