I have a HK G3 clone, and the .308 is very accurate. I have never shot a 30-06, but I figure if you are going with either, or considering another caliber you have to decide on what you are planning to do with the round and rfile. First decide on what you will be doing with the rifle itself. If you are hunting, plinking, or match competition shooting. If you are do all three, then I would suggestion you get a reliable, accurate, and comfortable rifle that you can use. If you want a bolt-action, lever-action or a semi-automatic action. Next is the round that the rifle fires. I will tell this story as a warning to those looking for a rifle. My cousin a few years back, was asking me what deer hunting round to go with, and naturally I told him you could use a .308 like my HK or 7.62x39 like my AK that I own. I knew my cousin, probably would not shoot his as often as I do my rifles, but I figured the ammo would be cheap and plentiful for him. He went out, and asked one of his friends the same question, and his friend suggested a .270, and he went with his friend's advice and picked up a Ruger bolt-action in .270. He took the rifle out a few times shot a deer with ith, and was disappointed with the rifle. He is now trying to sell the rifle.
. IMO the .308 was a poorly designed cartridge as the caliber is a bit underbore for the case capacity (6.5-7mm suits it much better). That said I also prefer the .280Rem. (7mm bullet) to the .30-06 by a narrow margin.
