.223 Winchester Super Short Magnum

.223 Winchester Super Short Magnum

Description

The .223 WSSM is a .224 caliber rifle cartridge created by Winchester and Browning based on a shortened version of the Winchester Short Magnum case. Wikipedia
 
Rifling twist1-7" to 1-9"
Case length1.670 in (42.4 mm)
Base diameter.555 in (14.1 mm)
Overall length2.36 in (60 mm)
Rim diameter.535 in (13.6 mm)