Well I called Savage today and they were unable to confirm which magazine length that it takes other than it is a "metal" magazine. I guess at this point I'll have to wait until I get it to find out. Hopefully it is the 3.850 CIP length magazine and not the shorter 3.715" magazine as that will limit the capability of the rifle, especially with 300 grain bullets. They did confirm that the 338 lapua mag that they offer in their store will not work with any of the new MDT chassis rifles and the mags need to come from MDT.