Your 'smith is wrong. The major diameter of a large ring mauser is approximately 1.1" the Remington is 1.062 nominal and usually under 1.060 actual. The Remington can be rethreaded to fit the Turkish which is a small ring thread (approx.1"). It is possible to bush the tenon and thread the bushing but otherwise the Remington can not be put into a large ring mauser. When installing a bushing to do this I turn the tenon to 15/16 and thread 20 TPI. The threaded bushing is installed with loctite then threaded to fit the mauser. Works fine.GD