Base of the Ruger is the same as most belted magnums, but the diameter at shoulder is much greater than unimproved magnums (7mmRM, 300WM, 338WM etc.). Since the Ruger arrived on the scene many have stated that it will fit right into a standard magnum action. That was not the case with my Herters action and would have required aftermarket bottom metal specifically for the Ruger round. So, add 5-600 bucks to the convert to a Ruger rather than a Taylor.