Winchester Short Magnum

Repeating Arms Company, the maker of Winchester rifles and one of the oldest firearms manufacturers in the United States.

Repeating Arms Company used the same concept and the same base case in creating its even shorter Winchester Super Short Magnum cartridges, three of which were introduced in 2003 and 2004.

The WSM family was inspired partially by a family of proprietary short magnum cartridges developed in late 1997,[3] by John Lazzeroni, derived from a previous line of magnum cartridges he had created.

[citation needed] Another influence was a series of 6 mm cartridges developed for bench-rest target shooting competitions in the 1970s.

[citation needed] The dimensions of the basic case are: The WSM family of cartridges are Delta L problem cartridges, meaning they can present unexpected chambering and/or feeding problems.

WSM and WSSM family of cartridges. From left to right: .223 WSSM , .243 WSSM , .25 WSSM , .270 WSM , 7 mm WSM , .300 WSM , .325 WSM .
The .300 Winchester Short Magnum demonstrates the accuracy of its name when compared to the .300 Winchester Magnum.