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.300 Winchester Short Magnum (also known as .300 WSM) is a thirty caliber rebated rim bottlenecked centerfire short magnum cartridge that was introduced in 2001 by Winchester. The cartridge overall length is 72.64mm, cartridge case is 53.34mm in length and the bullet diameter is .308 in (7.82mm), which is common to all U.S. .30 calibre cartridges. The principle at work in the short magnum cartridge is the advantage of fitting larger volumes of powder in closer proximity to the primer's flash hole, resulting in more uniform, consistent ignition. In field use, this round mirrors the performance of its older counterpart, the .300 Winchester Magnum. The .300 WSM is used in the Western United States for elk, mule deer, and whitetail and on the plains, where long range shooting is almost always a must.