I shoot a sporterized 03 in 06, original barrel, cut to 21", and it will shoot 3/4" 5 shot groups all day. I have repeatedly heard that the 308 has a slight /I] accuracy advantage over the 06 and the long range boys use it all the time, but 3/4" 5 shot groups from a rifle 80 years old , what more could you want. I installed a Pachy Decellerator pad on mine 5-6 years ago, and it helps a bunch. With light bullet loads, (110 - 150 gr. ) it's pleasent to shoot all day, and with it's capability of running the 220's, it will take anything in the 48, and with proper shot placement, (always important) Alaska too. The variety offered by the 06 is hard to beat (55 gr. accelerators up to 220). From a Hunting Arcticle "It's worth pointing out that the best of the standard .30-06 loads for long-range work, a 165-grain boattail softpoint, drops eight inches at 300 yards with a 200-yard zero and retains 1792 foot-pounds of energy. A 160-grain boattail softpoint from a 7mm Remington Magnum drops 7.2 inches at 300 yards with the same zero and has 1984 remaining ft.-lbs. A 180-grain spitzer, like Federal's Nosler Partition load, narrows the gap. With the same zero, it drops 8.6 inches to the 7mm's 7.9 inches, and it retains 1830 foot-pounds to the 7mm's 1960.
" That's 4/5 of an inch with a 5 gr. heavier bullet, from a gun that exhibits much less felt recoil. I was a long time comming to the 06, but now realize it will do anything I want from Coyotes with a 110 varmint bullet, to 180 gr. Noslers for big mulies.
ps: I will add like K.L.O. said too, a 243 will dust Whitetail all day long, and be more pleasent to shoot for a smaller lighter person, just not quite the versatility of the 06.