Ask Craig Boddington or any other hunter(notice I said hunter not shooter), he will inform you about the additional killing power of the 308 caliber. Also if you ever want to resell your rifle, the 30-06 will be considerably more valuable. Just go ask any gun dealer.
Well you said ask any hunter and I'm a hunter who has harvested animals with .284 and .308. I have noticed no difference in the ability to kill animals with my 7mm(.284)vs any of the .308 chuckers I own or have owned. BTW those animals include antelope, wt and mule deer, elk and moose. Bullet construction and putting it where it belongs are the main thing with putting down game, split hairs all you want to that has been my experience. I have no love for the 3006 a overratted cartridge IMHO. Jack of all trades but master of none, but yet due to it being in the .308 diameter class people seem to think it is a great all arounder..hum?? If I want or need to chuck the .308 diameter pills I'll skip the 3006 and go with 300, itgives thepotential of getting something out of the larger grained bullets in the .308 class. Just my opinion but I'm sure I'll get flamed for such comments. Oh well nothing I haven't heard in the past
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As far as resale 7mm rem mags fetch more dollars than 3006 here. Both arevery popular, much like the .270, .308and 300 WM's.