Does anyone know were I can find .275 Rigby cartridges, either loaded ammo or empty cases? I know that 7x57 Mauser is the same thing but I'm looking for cases with the Rigby head stamp to go with a friends custom mauser which has the barrel stamped as rigby.

I wouldn't need many since they would really only be used for display in the case.

http://www.kynochammunition.co.uk/

also I believe Rigby has made ammo in the recent past for it too.

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Give Quality Cartridge a call or send them an email. They have it listed on their Exotics page.

http://www.qual-cart.com/