On Our Mark: Episode 142 - 338 RPM and 338-378 WBY MAG Deep Dive episode artwork

EPISODE · Apr 22, 2026 · 35 MIN

On Our Mark: Episode 142 - 338 RPM and 338-378 WBY MAG Deep Dive

from On Our Mark: The Weatherby Podcast · host Weatherby Inc.

Overkill? Never heard of it. The 338 class of cartridges has their place in the hunting industry but where? Today, we're talking about all things 338 including the history and development of the 338-378 WBY MAG, where the 338 RPM fits in, and why you should chase antelope with a 338-378. In this episode we discuss:  - The big bores  - The 338-378 WBY MAG  - The history of the 338-378  - Design behind 338 RPM  - Where the 338-378 WBY MAG shines 

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On Our Mark: Episode 142 - 338 RPM and 338-378 WBY MAG Deep Dive

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This episode is 35 minutes long.

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This episode was published on April 22, 2026.

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Overkill? Never heard of it. The 338 class of cartridges has their place in the hunting industry but where? Today, we're talking about all things 338 including the history and development of the 338-378 WBY MAG, where the 338 RPM fits in, and why...

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