I never used anything heavier than 155 when I had the 308.......at 3000fps, they were very accurate. I tried SMK 2155's and 2156's, but found that Lapua Scenar's worked best in my rifle. (Swing mk4, 30" Bartlein barrel, set up for F/TR.)
I also tried various primers, but found that Murom KVB-223 Magnums were as good as any, (and cheaper than most...)
Pete