It was reported that the reaming was not done by a gunsmith but rather by a rather stupid owner who happened to have a .30-06 reamer.
This was done during the viral "sporterizing" craze of the late '40s and '50s.

Everyone was hacking away at the old military actions back then.


The Chosin Few November to December 1950, Korea.
I'm not one of the Chosin Few but no more remarkable group of Americans ever existed.