Really? You didn't use the search function for this one? I think there has been more written on reloading the 308 than any other cartridge in recent memory.
All powders work, and you'll find accuracy loads with H4895, IMR4895, Varget, Reloader15, IMR4064, TAC, Win748, etc. I'm tempted to try some of the 2000-MR I am using in 223 since it meters so well.
My accuracy load with 168 HPBTs is 41.5gr of IMR 4064, Winchester Brass, CCI BR-2 Primers. It isn't the fastest of the bunch but it shoots tight and brass life is good in bolt action rifles.
Machine guns are awesome until you have to carry one.