There is no "best" bullet weight.

The .308 is a very flexible round, used in a number of settings. For LR shooting, high B.C. bullets make sense.

For WT hunting, 2-300 yds, I like 130 gr. Hornady. It will blow thru a WT chest with good exit/entrance wounds and bleeding, often DRT. The 130's can be pushed at 3K fps.

For bigger critters, heavier bullets make sense.

So, for a "best" bullet, one needs to specify the task at hand. The answer changes.

IMO.

DF