Design
In traditional Weatherby fashion, a Weatherby cartridge would outclass similar-caliber cartridges with regard to the performance of the cartridge. To accomplish this task Weatherby relied on one of the largest commercial sporting cartridge cases available. The .416 Weatherby Magnum uses the same case as the .378 Weatherby Magnum and the .460 Weatherby Magnum. The case design was inspired by the .416 Rigby cartridge and features a belt and Weatherby’s signature double-radius venturi shoulder. Unlike the .416 Ruger and the .416 Remington, the .416 Weatherby Magnum requires an extra-large bolt face and large magnum action to contain the cartridge due to its oversized dimensions. Putting this in perspective, the .416 Weatherby Magnum has a case capacity of 140 gr. of water (9.09 cm3), an increase of 31% over that of the .416 Remington Magnum case.
The .416 Weatherby Magnum has been standardized by both the CIP and SAAMI. SAAMI recommends a 6-grooved barrel with a bore Ø of .408 in (10.4 mm) and a groove Ø of .416 in (10.6 mm) with a twist rate of one revolution in 14 in (360 mm). Weatherby's pressure rating is 65,000 psi (4,500 bar); however; Weatherby's own factory ammunition is loaded to lower pressure levels than this maximum. As with other Weatherby cartridges, there are discrepancies between SAAMI and CIP dimensions. This is arises from the CIP's treatment of the double-venturi case, shoulder and neck area of the cartridge. the CIP attempts to treat the shoulder as a conventional shoulder with transitional radius between each of the segments.
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