What do the recognized experts say?
I understand that 30.06 is a more powerfull than 308 winchester, but 308 win is a more accurate cartridge.
I remember reading that the m1 in 30.06 is marginally less accurate than m14 in 7.62nato, but m1s converted to 7.62 proved to be more accurate than the m14s. Both cartridges are good deer and elk rounds, but too powerfull for combat shooting. If combat was still what it was in wwI when soldiers did most of their shooting stationary, they would be great, but it isn't.
The 3 most important characteristics of a modern infantry rifle are: reliability, controllability, target acquisition speed, this has to be balanced with leathality
I also know that, and this is difficult for people to believe, DOD tests showed that field grade m16s shot tighter groups than field grade m14s.