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It is Definitely 5.56, here's a link to a better picture of the container & contents. https://www.floridagunexchange.com/hornady-frontier-55-gr-fmj-5-56-nato-150-rounds.html

Hi Joshua and welcome. This upc is 5.56 NATO ammunition and not .223 ammunition. Cheers, stay safe and happy holidays!

its 5.56 see ****** Description: American made and military grade are the hallmarks of Frontier Cartridge. This line of ammo gives shooters the best of both worlds. It is configured for a wide range of shooters and applications, from target/match shooting to varmint hunting. Frontier Cartridge features brass cartridge cases and military grade boxer primers and propellant. Brand: Frontier Cartridge Category: Centerfire Rifle Rounds Series: M193 ********Caliber: 5.56x45mm NATO Model: Rifle Rounds Per Box: 150 Casing Material: Brass Muzzle Energy: 1282 ft lbs Muzzle Velocity: 3240 fps Game Type: Small Game Application: Hunting Boxes Per Case: Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 gr

Hi Joshua, this is 55 grain 5.56 NATO FMJ ammo. Stay safe & have a great day!