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My vote is to chamber the .430 barrel for 44 Automag (edited). The case length for 44 mag is1.285. To make rimmless 44mag simply cutt a 7.62 x 39 case off at that length and run it through a 44mag sizing die.
The only thing needed is a reamer that will cut a chamber so the case can headspace on the case mouth. Reloading will be safe using 44mag data. As a bonus the cartridges will fit into standard AK magazines. 20, 30 or 40 rounds of 44 mag available for knocking over anything walking the planet. I think I want one!

Edit: I forgot about the Automag. It used 308 cases to make rimless 44 mag.