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Pat, I would not think so. The bases of these cases are not the same. Not only would the "bullet jump" be huge to the throat with the .445 supermag. 444 marlin is larger than the .445, (not just longer - totally different parent case) and there would be considerable slop in the fit to the chamber. I would not shoot anything that is not listed on the barrel.

Pat, no Sir. The cartridge case dimensions are different enough that you should not risk trying this for safety and warranty reasons. Cheers and stay safe Sir! Discussion on the very topic here : -- http://www.rugerforum.com/phpBB3/viewtopic.php?t=117606