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The.300 Winchester Magnum is a belted, bottlenecked magnum rifle cartridge that was introduced by the Winchester Repeating Arms Company in 1963. The.300 Winchester Magnum is a magnum cartridge designed to fit in a standard rifle action. It is based on the.375 H&H Magnum, which has been blown out, shortened, and necked down to accept a.30 caliber (7.62 mm) bullet. Wikipedia