This is how I see it.
The 308 is one of the most under rated but not over looked cartridges on this planet. I would not argue the fact with a 30-06 there almost the same, and the 308 in general will out shoot accuracy wise any 30-06 I have owned.
However the 308 at muzzle is only 25% less than the 300 win mag, and in hunting camps around the world the 308 win gets a bad rap.
FYI
Core lock bullets used (ie

300 win mag 180s = 3500 foot lbs
308 win 180s = 2800 ft lbs
So the 300 win mag kicks but right WELL! lets look at 500 yards
300 win mag 180s 500 y = 1350 f lbs
308 wim 180 500 y = 1100 f lbs HUMM!
30-06 -----------------= 1161 ft lbs
Is 200 f lbs worth talking about at 500 yards along with accuracy at that range!
As for the 30-06 at long distace500 yards the fps difference is less than 40 fps?
You be the judge!
I don't know why but gets a bad rap but one of the easiest rounds to shoot accurate at 300+ yards with almost the same energy as your Mags and equal to the 30-06.
regards jay