Hornady Frontier Cartridge 5.56x45mm NATO 55 gr HP Match, 20 Rounds Hornady Frontier Cartridge 5.56x45mm NATO ammunition with a 55-grain hollow point (HP) Match bullet gives AR-15 shooters a fast, flat-shooting load for target work and varmints. Each box holds 20 cartridges, and the load is rated at 3,240 fps and 1,282 ft-lbs at the muzzle from a 24-inch test barrel. American made and military grade are the hallmarks of Frontier Cartridge. The line covers a wide range of shooters and uses, from plinking, target and match shooting to varmint hunting and law enforcement training. Shop Hornady Frontier 5.56 NATO 55 gr HP Match at BattleHawk Armory. A brass-cased match load for rifles chambered in 5.56x45mm NATO. 55-Grain HP Match Bullet The 55-grain hollow point Match bullet carries a G1 ballistic coefficient of .254 and a sectional density of .157. At 55 grains it stabilizes in nearly every 5.56 twist rate, from 1:12 to 1:7, so it is a versatile choice for most AR-15 rifles, and the high muzzle velocity keeps trajectory flat for small targets and varmints. Frontier Cartridge Construction Brass cases: Frontier Cartridge loads every round in brass cartridge cases. Military-grade components: Military-grade boxer primers and propellant. Hornady bullets: Target-friendly, non-steel-core Hornady bullets. Consistent loading: State-of-the-industry loading techniques and quality control procedures go into every round. American made: Produced in the USA. Specifications Brand: Hornady Frontier Cartridge Item number: FR240 UPC: 090255711479 Caliber: 5.56x45mm NATO Bullet: 55 gr Hollow Point (HP) Match Ballistic coefficient: .254 (G1) Sectional density: .157 Muzzle velocity: 3,240 fps Muzzle energy: 1,282 ft-lbs Test barrel: 24 in. Case: Brass, boxer primed Rounds per box: 20 Boxes per case: 25 Frequently Asked Questions Can I shoot this in a .223 Remington rifle? This is a 5.56x45mm NATO load. Fire it only in firearms chambered for 5.56 NATO, or in chambers the firearm's maker marks as safe for 5.56 NATO, such as .223 Wylde. Check your barrel markings and owner's manual. Will a 55-grain bullet stabilize in my AR-15? 55-grain bullets stabilize in the common 5.56 twist rates, including 1:7, 1:8, 1:9 and 1:12. How many rounds are in a box? Each box contains 20 cartridges. What is it best used for? Target shooting, varmint hunting and general range use in 5.56 NATO rifles. Want a heavier bullet for longer range? See the Hornady Frontier 5.56 NATO 68 gr BTHP Match, or browse more rifle ammunition.