The .300 Weatherby Magnum is Roy Weatherby's signature cartridge and the most commercially successful of his proprietary rounds. A 180-grain bullet exits at approximately 3,240 fps — significantly faster than the .300 Win Mag. It has taken game on every continent and remains one of the most powerful standard-bolt-action cartridges available. The Mark V action with nine locking lugs was engineered with this cartridge in mind. Type: Rifle Action: Bolt-Action Caliber: .300 Wby Mag Capacity: 3 Year introduced: 1944, USA Weight: 8.5 oz Overall length: 46.5" Status: Active Intended use: Hunting, Long-Range Shooting