The only thing that I ever recall seeing which comes close to qualifying was a semiauto version of the old Russian PPsH. It's been several years ago, and I don't remember who made/imported it. I only looked it over, briefly, at a show because I have a mild fascination with firearms curiosa and this definitely qualified. The asking price was about $400, a good deal more than I was willing to spend for what would essentially (for me) be a 'toy', so I didn't examine it very closely.
Frankly, I doubt that you'll be able to find any longarm at all, other than a semiauto version of some European submachinegun, in this caliber. There's always the custom/conversion option if you simply must have one, but it isn't going to be inexpensive.
Sorry.