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It is the 7X57 mauser cartridge just renamed by the Brits so Rigby could feel better about it. They are the same cartridge.

That's just a fancy way of saying 7x57mm mauser, which is available from PPU and other manufacturers at fairly reasonable prices.

The 7×57mm cartridge, also known as the 7mm Mauser, 7×57mm Mauser, 7mm Spanish Mauser in the USA and .275 Rigby in the United Kingdom https://www.budsgunshop.com/catalog/ammo_search.php/caliber/10000820/v/1/sort/1a/7mmX57mm+Mauser