This is PMC Bronze .223 Remington 55-grain FMJ ammo. 

Hit your target with PMC Bronze .223 Remington ammo. This popular varmint hunting and target-shooting round delivers exceptional accuracy at an affordable price. A 55-grain projectile quickly takes out medium-sized game. Featuring premium brass casing and primers manufactured, it includes clean-burn powders for consistent and reliable performance. Double down on firepower and try out some PMC .223 ammo.