The 300 Winchester Magnum calibre, also known as the 300 WM or 300 Win Mag, was invented and launched by the Winchester Repeating Arms Company in 1963. It is a powerful, long-range cartridge carrying a .308 inch (7.85 mm) bullet with a mass that usually varies between 9.72 grams (150 grains) and 11.66 grams (180 grains). This excellent ammunition is intended for walked-up hunts, hunting from hides, and long-range shots; its high performances make it a popular choice for driven hunts in France, where it is also widely used. It is also a very popular cartridge for hunting large game, especially deer, in Europe and North America. The 300 Winchester Magnum is also used by the military as a sniper round. Winchester has built on its experience and success with this widely used cartridge to bring out seven loads solely for this fully optimised calibre.