The Arisaka in question here was at one time (and may still be) in the hands of the NRA where it was sent by the gunshop owner who purchased the "hard kicking" rifle from the Bubba who ground down the pilot of a .30-06 reamer to fit the 6.5mm bore.
I read about the initial report of this in a late '40s early '50s issue of American Rifleman.
It is not apocryphal, it is true and they had pictures of the rifle and the bullets recovered after firing it. With a long string!
