Initially a wildcat cartridge developed by Roy Weatherby in 1959 at the request of the United States Army. This white-hot cartridge is based on the 378 necked down to 30 caliber and packed with powder. Originally billed as the world's fastest 30 caliber cartridge, it will push a 30 caliber bullet 3500 fps. Reintroduced as a Weatherby production cartridge in 1996.
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- Manufacturer: Weatherby
- Ammo Bullet Type: Ballistic Tip
- Ammo Casing Type: Brass
- Ammo Bullet Weight: 180 grain
- Ammo Round Count: 20/Box
- Caliber Multi: .30-378 Weatherby Magnum
- Muzzle Energy: 4676 lb/ft
- Muzzle Velocity: 3420 fps
- Application: Medium Game
- Series/Collection: Select Plus
- Ballistic Coefficient: 0.507
