Or have your gunsmith alter the rifle. My two SA M77 tang safety Rugers will fit and feed ammo with a coal of 3.050". Work done by Joe Reid at Harry Lawson Co in Tucson.
The last comment had me remembering that the Tikka T3 light my friend owns in 308 was able to install a 30-06 mag box. It required altering the bolt stop. Can't quote the new COAL off the top of my head.