 .223 Winchester Super Short Magnum

The .223 WSSM (Winchester Super Short Magnum, 5.56×42mm) is a .224 caliber rifle cartridge created by Winchester and Browning based on a shortened version of the Winchester Short Magnum case.The .223 WSSM was introduced in 2003 by the Browning Arms Company, Winchester Ammunition, and Winchester Repeating Arms Company.