RE: Can the 30-06 *really* do everything a 308 can?
I have an 06 and a 300 WSM both will shoot .6" groups at 100 yards with 165gr and 180gr hot handloads. The WSM really surprised me though, I loaded up some 150gr Remingtons at 3300fps and shot a 1/2" at 100 yards. More unbelievable still is that I loaded up some 110gr SP at 3600fps and shot a 1/2" at 100 yards. I was expecting a 3-4" group not a 1/2" group. The 30-06 is a custom Mauser 98 and the WSM is a Stainless Ruger M77 Mk II. Every gun shoots differently If you are happy with 308 velocities get a 308, if you want 06 velocities get an 06. If you want a fast short action caliber get a 300 WSM. They are all very good and accurate calibers.
A good trigger and scope have a lot more to do with good accuracy than one would think.