Rigby used Mauser actions and the Germans already had a cartridge labeled the 7Mm Mauser. Rigby who had an agreement with Mauser adopted the cartridge in 1907 as the 275 Rigby. This designation comes from the British method of using land diameter vs groove or bullet diameter for naming a cartridge. The cases are identical.
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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