.338-378 Weatherby Magnum
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.338-378 Weatherby Magnum | ||||||||||||||||
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Type | Centerfire/Rifle | |||||||||||||||
Place of origin | United States | |||||||||||||||
Production history | ||||||||||||||||
Designer | Elmer Keith and Bob Thomson | |||||||||||||||
Designed | 1963 | |||||||||||||||
Manufacturer | Weatherby | |||||||||||||||
Produced | 1998 | |||||||||||||||
Specifications | ||||||||||||||||
Parent case | .378 Weatherby Magnum | |||||||||||||||
Case type | Belted, bottleneck | |||||||||||||||
Bullet diameter | .338 in (8.6 mm) | |||||||||||||||
Neck diameter | .361 in (9.2 mm) | |||||||||||||||
Shoulder diameter | .560 in (14.2 mm) | |||||||||||||||
Base diameter | .582 in (14.8 mm) | |||||||||||||||
Rim diameter | .579 in (14.7 mm) | |||||||||||||||
Rim thickness | .059 in (1.5 mm) | |||||||||||||||
Case length | 2.905 in (73.8 mm) | |||||||||||||||
Overall length | 3.65 in (93 mm) | |||||||||||||||
Case capacity | 125 gr H2O (8.1 cm3) | |||||||||||||||
Rifling twist | 1 in 10 | |||||||||||||||
Primer type | Magnum Rifle | |||||||||||||||
Maximum pressure | 63,817 psi (440.00 MPa) | |||||||||||||||
Ballistic performance | ||||||||||||||||
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Test barrel length: 28 in (71 cm) Source(s): Weatherby [1] |
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] This design was chosen for elk hunting, using the powders available at the time, such as Hodgdon H-4831.[4] Due to the continued popularity of the KT, Weatherby introduced the .338-378 Weatherby Magnum in 1998 to its line of commercial ammunition, using a full-length 2.908" case.[5] Although based on the .338-378 KT, the .338-378 Weatherby Magnum and the KT have different load data and chamber sizes and are not interchangeable.[6]
See also[edit]
References[edit]
- ^ "Weatherby". Archived from the original on 2008-03-25. Retrieved 2018-11-26.
- ^ :https://loaddata.com/Article/LabNotes/338-378-Weatherby-Magnum/621
- ^ ".338-378 Weatherby Magnum".
- ^ "338-378 KT | Cartridge Collector".
- ^ ".338-378 Weatherby Magnum".
- ^ ".338-378 Weatherby Magnum | Load Data Article".