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 3,500 feet per second. Reintroduced as a Weatherby production cartridge in 1996.
The information below comes from our Gun Caliber Dictionary and is for
general reference only. It does not describe the specifications of this
particular item.
The 30-378 Weatherby Magnum is based on the huge 378 Weatherby Magnum case necked down to .30-caliber. Wildcatted for years, it was introduced by Weatherby in 2005. Its extra-large belted case requires a magnum-sized action, and longer barrels (at least 26 inches) are needed to burn its massive powder charge and reach full velocity--but it is the fastest commercial 30-caliber cartridge. Recoil and muzzle blast are severe, and it is an overbore capacity cartridge, meaning that powder selection is limited and throat erosion will be rapid. Despite these limitations it is both fast and powerful, and has thus found favor with today's growing community of long-range shooters. Weatherby is the primary source for both rifles and factory ammunition.
—
Craig Boddington
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