The 300 Winchester Magnum calibre, also known as the 300 WSM, was introduced in 2001. It matches the external and terminal ballistic performances of its predecessor, the 300 Winchester Magnum, in a shorter case. The Winchester 300 Short Magnum does everything the 300 Winchester Magnum does. Both calibres use the same bullets, with a mass of between 9.72 grams (150 grains) and 11.66 grams (180 grains). The benefit of the 300 WSM is that it can be used in guns with a shorter action than the standard magnum with a non-belted case. The 300 WSM is ideal for shooting large European mammals such as stag, mouflon and boar, and elk in the USA. It serves its purposes to the full during long-range shooting and on driven hunts, proving to be a valued calibre for most hunters. Winchester offers three high performance loads capable of meeting hunters every expectation.