I've seen a couple of Russian guns that might just fit into that category: the MP-412 Rex (.357 Magnum) and the SILENT OTS-38 (7.62X42 SP-4). Have a look. See what you think
They're not that new, though
There is an automatic revolver, though the Mateba Model 6 Unica (.357 Magnum).... It's a BEAST.