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People have used many different terms for different ammo in the past. 8mm Mauser is called many different things for example. 8mm, 8x57mm, 7.92mm, 7.9mm, etc.

7.5 Swiss or 7.5 French both use...

A lot of work went into that. Another thing to consider is it appears to be chambered in a rimless cartridge which also means they had to modify the magazine to work with rimless ammunition.