Accuracy...
in each rifle is an individual thing, Mwpslp. Individual as in 2 rifles, same model, same everything, may have different preferences as to ammo.
IMHO, the 165 grain bullet is the best all-around bullet for accuracy in most .30-'06's, but even there, individual rifles have individual preferences.
There is some awfully nice off-the-shelf ammo available nowadays. Naturally, the better stuff costs more. My suggestion (tho' it would be spendy) would be to buy a box of as many different loadings of .30-'06 as you can find, and go shoot them for accuracy in your rifle. Your rifle will show a distinct preference for certain brands, bullet weights, and bullet types, I expect. Then you pick one that is to your standard of accuracy, in YOUR rifle (not mine, not anybody else's) which would be well adapted to your intended hunt quarry.
The other upside is that you get lots of practice with your rifle, and if it has any peculiarities of function you will become good at dealing with those. Besides, shooting is fun.
Bottom line: There is no "best ammo." What's good in my rifle may not work worth a durn in yours, and vice versa. You just have to experiment. Start with 165 grain bullets.
And as always, the journey is part of the destination.