You say potato, I say small block chevy.
On a serious note, I have always heard that the .308 is a more inherently accurate round than the 30.06. Something to do with case design, shape, or something of that nature.
Slamfire seems to have somewhat confirmed that with his post about his friend that is a nationally ranked shooter.
Moby, that is an awesome rifle you have there. I had an Armalite AR-10(T) that I had to sell a few years back. I still kick myself for doing it, but it was for the right reason. (Son was born, I was unemployed)
I plan on having another one sometime. Maybe not the target version, but an AR-10 nonetheless.