I guess you would call my CFSC instructor my "mentor", and he says that he doesn't like making .270 out of 30-06 because he's afraid someone may read the datastamp on the brass and use the ammo in the wrong rifle.
Let's start at the beginning shall we?
No one should be shooting his 270-made-from-30-06 ammo except him.
Silly excuse on his part, right?