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The .378 Weatherby Magnum

Created in 1953, this big, powerful rifle cartridge had 43 percent more case capacity than the .375 H&H.

The .378 Weatherby Magnum

The .378 Weatherby Magnum (center) greatly exceeds .375 H&H (left) power. It derives from the case for the .416 Rigby (right). (Shooting Times photo)

After we finished editing Speer Reloading Manual #13, one reviewer took us to task because the .378 Weatherby Magnum was not included in that edition. It was neither an oversight nor a lack of trying.

Most Weatherby cartridges made the transition from proprietary to industry-standard cartridges just as Speer #13 began development. The manual team was also changing departments to become part of Development Engineering, and that took time. We were struggling to get new pressure barrels, reference...

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