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There is no mention of .275 Rigby in any of their catalogs - or by anyone else. The earliest reference is from an American gun writer in 1970. . . .

Bloody Americans getting it wrong! Ha ha. Joke.

But this Stoegers Catalogue of 1939 shows some evidence of where the nomenclature came from.

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Not so fast. Who mis-labeled it from metric in the first place? ;^]