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Image below showing labelling of the lid end of the same old Rigby ammo box with ammunition referred to as .275 Mauser not .275 Rigby. Pity cartridge head-stamps can't be seen to confirm exactly what nomenclature was applied to the ammunition. I'm betting most likely 7x57 or in keeping with the age, 7mm Mauser.
Or this, for the 'Rigby No. 2' double rifle:
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