.223 Remington Reloading Brass Washed and Polished Rifle Brass for Reloading Headstamps Are Mixed Unprocessed Range Brass 100% Brass Casings May contain 5.56 500+ Casings Reload with confidence using our fired .223 brass. 223 brass shares dimensions with the military|grade 5.56 NATO round, though with slight pressure and chamber differences. These 223 reloading brass cases offer a cost|effective way to stock up on bulk 223 cases for your reloading needs. Available in 55 gallon drum quantities.