Winchester Rifle Brass .223 Winchester Super Short Magnum Unprimed 50/Pack. This 223 Remington Super Short Mag Brass is unprimed so it can be loaded without a primer. It's just the raw material that's needed for reloading so it's the best bet for reloading your .223 Winchester Super Short Magnum cartridges. The .223 Super Short Magnum is a less powerful version of the .223 Remington Magnum but it still carries the same power and potential just in a smaller size. That's why it's the perfect choice for handguns that chamber .223 Super Short Magnums. Specifications for Winchester .223 Winchester Super Short Magnum Unprimed Rifle Brass: Manufacturer: Winchester Primed: No Cartridge Case Material: Brass Package Contents: Winchester .223 Winchester Super Short Magnum Unprimed Rifle Brass Winchester WSC223WSSU: Rifle Brass .223 Winchester Super Short Magnum Unprimed 50/Pack