Design and Specifications
The .338 winchester Magnum follows the modern cartridge designs in that the cartridge case features a case with minimal taper so as to maximize case capacity yet providing reliable feeding and extraction. The .338 Winchester Magnum is based on the .375 H&H Magnum, which was shortened to 2.500 in (63.5 mm), blown out and necked down to hold a .338 in (8.6 mm) bullet. The case has a capacity of 86.0 grain of H2O (5.58 cm3). The cartridge follows the design of the standard length Weatherby Magnum cartridges such as the .257 Weatherby Magnum, .270 Weatherby Magnum and the 7 mm Weatherby Magnum for which Winchester had supplied basic brass until 1948.
Both the Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives(CIP) and the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) govern and regulate the specifications regarding the .338 Winchester Magnum.
SAAMI and the CIP recommend a 6 groove barrel with a twist rate of one revolution in 10 in (250 mm) barrel with a bore Ø of .330 in (8.4 mm) and a grove diameter of Ø of .330 in (8.4 mm) with each groove having a width of .110 in (2.8 mm). The SAAMI recommended average peak pressure for the cartridge is 65,000 psi (4,500 bar). The CIP enforces a 4,300 bar (62,000 psi) pressure limit for the cartridge.
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