Design and Specifications
The .375 Weatherby Magnum is an improved version of the .375 H&H Magnum. The parent case is based on the .300 H&H Magnum blown out and necked up to accept a .375 in (9.5 mm). The cartridge features the Weatherby double radius shoulder. The Weatherby Magnum is not considered a proprietary cartridge as the CIP has published specifications for the cartridge.
CIP recommends a 6 groove barrel with grove width of 3.25 mm (0.128 in), a bore Ø of 9.35 mm (0.368 in) and a grove Ø of 9.55 mm (0.376 in). The recommended twist rate is one revolution in 305 mm (12.0 in). Case capacity is 105 gr. of water (6.82 cm3).
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