handirifle, I see no good reason this couldn't be done, should make a nice shooter, wish I could tell you of a smith, but i've no idea, though I can't imagine it hasn't beeen done before. I still remember a conversation I had with a fellow just after Ruger stopped making their 357 Max revolver. The conversation was about our confusion that neither Winchester nor Marlin had picked the cartridge up. Strikes me that it would make a perfect cartridge for a lever. I do wonder though if there is enough difference in length to make firing a 357 Mag from the magazine practical. I think the shorter cartridge may hang up, but I'm no expert on levers. I would persue the Winchester in such an event, it loads singly from the open action very easily. Good Luck, JP