Accuracy varies greatly between different people. When developing loads for my bolt guns I aim for .25moa at 100 yrds, but I know people who load for their bolt guns and are happy with 1moa at 100 yrds.
For most 308 bolt guns I have seen they generally all like the 168 SMK, 175 SMK, 168 A-Max and 178 A-Max over a variety of powders. I have always had Varget and all my rifles love it.