May be late again for the thread , but when my son had his .308 barrel (15"), I used the same load that had worked for me so well through the years in my 788 Remmy....150 Sierra spitzer , pushed with IMR 4895 , and a LR primer. He got amazing results , true clover leafs at 100 yds...benched over bags of course , using a T/C 2-7 scope. We tried a 130 Horn Spire point , with a few various powders , nuttin shot like the afore mentioned load. So.......we couldn't do much better than that. At 200 yards , he was shooting something 2-2 1/2 inch groups. Can't believe he sold that barrel !! Good shooting !!