The Bulk 223 Ammo (designated as the 223 Remington by the SAAMI^[3] and Bulk 223 Ammo by the CIP^[4]) is a rimless, bottlenecked rifle cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm.