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By the looks of the magazine box and the clip slot, I doubt the twin if this rifle shown via that link is set up for a rimmed cartridge.

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That's what I was thinking (and that he'd tried a 9X57). It seems that most of the .360 are rimmed cartridges, so they'd be easy to rule out.

It could be this - .360 Westley Richards Rimless Nitro Express, introduced in 1912 for magazine fed bolt rifles.