.378 Weatherby Magnum

Common card · No. 470705

The .378 Weatherby Magnum was designed by Roy Weatherby in 1953. Although inspired by the .416 Rigby, it is an original belted magnum design with no parent case. The cartridge features a high powder capacity relative to its bore size, and can hold upwards of 7.13 g (120 gr) of powder. This consideration prompted the Federal Cartridge Company to introduce the 215 Magnum primer specifically for this round. The .378 shares the double radius shoulder design found on the other Weatherby magnum cartridges. The impetus for the development of the .378 arose from Roy Weatherby's extensive field testing conducted in African hunting grounds. Based on his safari experiences, he believed it to be desirable to improve the performance afforded by his preexisting .375 Weatherby Magnum by devising a larger cartridge more in keeping with the design philosophy of his small-bore cartridges, such as his .300 and .257 Magnums. To promote the .378, Roy Weatherby killed an African elephant with one shot at extended...

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