The only rifle I know that qualifies is the Kel-Tec Sub-2000, and that's a semi auto. There's four configurations, 9mm or .40S&W and Glock or "not-Glock". The 9mm +P is supposed to pick up enough steam to be in the .357 class. I don't recall anything about the 40S&W ballistics, but that's a more powerful cartridge, IIRC, so the extra barrel probably makes it more powerful than a .357mag. I don't know.
People keep trying to sell them in Auction Arms for over $300 (figure $50 more for shipping and ffl assistance), with few buyers. You might find one near you without the $50 extra that's worth buying.
The part I like best is that it folds in half (make certain the gun is unloaded first or you can break the extractor), making the gun very easy to store and safe to handle, as the chamber is separated from the firing pin. No way in the world for it to fire while folded unless you really work at it.
There's a Kel-Tec forum here, with little activity. This one is pretty active:
http://www.ktog.org/cgi-bin/yabb2/YaBB.pl?board=102My .40S&W Sub-2000 needed a bit of clean up, casting flashings sticking out, a little warpage, etc, but it's shaping up fairly well.