Also known as: 300 win short mag, 300 WIN.SHORT MAG., 300 WSM (Winchester Short Mag), .300 Winchester Short Magnum, 30-338 Winchester Mag, 300 WSM
Winchester introduced the .300 Super Magnum in 2001. The most marked advantage is that it fits large volumes of powder close to the flash hole so you get more consistent ignition. In terms of performance, it is closely related to the Win Magnum, but it offers an alternative that is shorter and lighter.