What are you going to do with this load? If it`s going to be used for hunting, make sure the big game animal is close to insure proper bullet expansion. A 308 doesn`t really have enough gas in the tank for that much payload.
I had very similar results to what MM posted. I was also using R17 and a 26" 1/12 bbl. I dont remember the load info off the top of my head but I will dig it out tomorrow and post my findings. I got the idea to try them when I was trying to make the 208 Amax work in that same rifle. I wasnt having any luck at getting the 208 to stabilize.