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223 Rem New Remington Brass in Bags of 100
The.223 Remington (.223 Rem) cartridge is used in rifles. In December 1963, the Remington 760 rifle was the first weapon to feature the.223 Remington cartridge. In 1964, the.223 Remington cartridge was approved for use in the Colt M16 rifle, which became the United States' alternate standard weapon. Army. The M193 military version of the cartridge has a 55 grain complete metal jacket and a boattail shape.