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The .30-378 Weatherby Magnum is a .30 caliber, belted, bottle-necked rifle cartridge. [2] The cartridge was developed in response to a US Army military contract in 1959. While still unreleased to the public, the cartridge went on to set world records for accuracy including the first ten 10X in 1,000 yards (910 m) benchrest shooting. [ 3 ]
The .378 Weatherby Magnum was designed by Roy Weatherby in 1953. [ 3 ] [ 4 ] Although inspired by the .416 Rigby , it is an original belted magnum design with no parent case. [ 5 ] The cartridge features a high powder capacity relative to its bore size, and can hold upwards of 7.13 g (120 gr ) of powder.
7mm Weatherby Magnum.30-378 Weatherby Magnum.224 Weatherby Magnum.240 Weatherby Magnum.257 Weatherby Magnum.270 Weatherby Magnum.300 Weatherby Magnum; 6.5-300 Weatherby Magnum.338-378 Weatherby Magnum.340 Weatherby Magnum.375 Weatherby Magnum.378 Weatherby Magnum.416 Weatherby Magnum.460 Weatherby Magnum
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Weatherby still produced some custom rifles in South Gate following this contract. [1] Weatherby's first break from designs based on Mauser actions came in 1956 when he commissioned the Danish firm of Schultz & Larsen to build the 378 Weatherby Magnums utilizing the Schultz & Larsen Model 54 bolt-action. This action was very stout and had ...
7 mm Weatherby Magnum.300 Weatherby Magnum.30-378 Weatherby Magnum.340 Weatherby Magnum.338-378 Weatherby Magnum.375 Weatherby Magnum.378 Weatherby Magnum.416 Weatherby Magnum.460 Weatherby Magnum.22-250 Remington *.243 Winchester.25-06 Remington.270 Winchester; 7mm-08 Remington; 7 mm Remington Magnum.308 Winchester.30-06 Springfield
Historically, Weatherby claimed that this is the most powerful .30 caliber magnum rifle commercially available, but the recently introduced .300 Remington Ultra Magnum, the .300 Norma Magnum and Weatherby's own .30-378 Weatherby Magnum are now more powerful. Of course there are quite a few very large .30 caliber wildcat cartridges.
The .338-378 Weatherby Magnum is based on the .338-378 KT, a wildcat cartridge created by Elmer Keith and R.W. "Bob" Thomson in 1966. [2] The KT is based on the .378 Weatherby Magnum cartridge but is shorter by 1/4" and necked down to a .338 caliber bullet. [ 3 ]