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I haven't heard of the cartridge before but found that that Holt's listed a 9.5x57R MS model 1910 rifle in their Dec 2011 auction:


Maybe they got it wrong or maybe it was one of those cartridges that was developed and then disappeared just as quickly. 9.5x57 MS rimless is a known cartridge, and Europeans often made rimmed version of rimless cartridges to suit popular break open actions. Maybe that's the case here. I look forward to better informed details from the many experts on this forum.

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Do tell! This one's a brain tickler.

If I were to assume, I'd speculate that the 'R' is an error.

What I can tell from the photo on linked auction listing is that it is an MS with receiver manufactured before mid 1924 as that is when the 'Made In Austria' stamping was added to front receiver ring. The s/n being visible 'above the wood' is unusual. 'Twould be nice if there were more photos.

I still find it hard to imagine that system working well (if at all) with a rimmed cartridge and / or why anyone would modify one to do so. An 'experimental model'?

I'll be watching this thread with considerable interest and do hope member Kuduae will provide insight or opinion as he is very knowledgeable of continental firearms of this era.

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Citizen of the Cherokee Nation

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