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I am in violent agreement that a rimmed cartridge should not work in a Schoenauer magazine. It is NOT a straight walled case, it looks just like my other 9.5 bottle necks, it just has a rim.

I bet 16 euro that the "R" in the description was a mistake. I lost that bet.

The box is marked "9.5X57R MS". The case, as above, is marked "9.5X57 M.Sch."

So this shouldn't exist, but there it is in my kit.

I agree, it would make an interesting kiplauf or double rifle, or may even work well in a drilling or vierling. I just don't know if I'd ever come across such a beast. The Holt's one looks interesting, and I may have paid 400 pounds... but brass will always be a problem for any of the above, so I'm not "that" interested.

I am curious if anyone else knows anything about this. It's a mystery to me. 16 euro does not disturb me, now I'm just curious.

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I'm sure we're all rather curious about this one. That's quite the 'unicorn' you've got there.

I posted, "If I were to assume, I'd speculate that the 'R' is an error", in response to the Holt's auction listing shared by Hunter, not in regards to your purchase of cartridge cases.

Of all speculations posted thus far, I'm speculating that the most likely is the passage you shared from cartridge colector.net that stated, "might have been a special order for a client."

It doesn't seem likely that they'd be someone's 'wildcat' as that would not account for the mysterious head stamp.