Introduced in 1963 the 340 Weatherby was designed as a response to the 338 Winchester Mag. However Roy took advantage of the longer case to pack in more powder for greater velocity. And it shoots heavier 338 bullets at higher velocities as well a decidedly powerful combination. Ideally suited for animals the size of elk or larger the 340 can also be used by deer hunters with lighter bullet weights. - Caliber: 340 Weatherby Magnum - Bullet Type: Hornady Interlock - Bullet Weight: 250 gr - Muzzle Energy: 4002 ft / lbs - Muzzle Velocity: 2685 fps - Rounds Per Box: 20