The point is that with a longer case and 19% more powder space, an extra .1" in bullet length isn't going to handicap a .30-06 the way you think it does a .308 Win.
The "handicap" from a longer bullet is about the same in either case since the bullets are the same diameter, and thus the loss of powder space is exactly the same. Twist and turn however you like, but the fact of the matter is that there is almost no performance difference between the two cartridges, and zero practical difference. if you think .30-06 is good, then you have to think .308 is better because it does the same thing with less weight and/or recoil.
