The .300 Winchester Magnum descended from the legendary .375 H&H cartridge which developed through many successful hunts in Africa, a reputation of being capable of taking every game animal on the whole continent. Following in the footsteps of its predecessor, the .300 Win Mag has a reputation of being able to take any game animals in North America. The .300 Win Mag in most cases enjoys a velocity advantage of nearly 300 feet per second over the .30-06, a cartridge that lives up to its heritage and name.
The popularity of the .300 Win Mag surged again in the early years of the new millennium since the US Army started converting its sniper rifles from .308 Winchester to the .300 WM cartridge, which is able to engage targets of human size at ranges as great as 1200 meters. This distance is 50% farther than the reach of the .308 Winchester, which is itself a very effective sniper rifle cartridge.
The .300 Win Mag is commonly chambered in rifles with bolt actions like the Remington 700 and the Winchester Model 70. It has, however, also been chambered in semi-automatic rifles like the Browning BAR and even lever action rifles including the Browning BLR.