.375 H&H Magnum - Wikipedia
https://en.wikipedia.org/wiki/.375_H%26H_Magnum
WebThe .375 H&H Magnum, also known as .375 Holland & Holland Magnum, is a medium-bore rifle cartridge introduced in 1912 by London based gunmaker Holland & Holland. The .375 H&H cartridge featured a belt to ensure the correct headspace, which otherwise might be unreliable, given the narrow shoulder of the cartridge case.
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