The .338-378 Weatherby Magnum is a .338-caliber cartridge built on the massive .378 Wby Mag case, pushing a 250-grain bullet past 3,000 fps. It occupies the extreme upper end of what standard bolt actions handle, with muzzle energy exceeding 5,000 ft-lbs. Intended for the largest dangerous game or extreme long-range hunting, it requires the full-length Mark V action and is known for significant recoil. Type: Rifle Action: Bolt-Action Caliber: .338-378 Wby Mag Capacity: 2 Year introduced: 1998, USA Weight: 10 oz Overall length: 48" Status: Active Intended use: Hunting, Long-Range Shooting