My Savage 10 FP shoots both 150 grain and 168 grain bullets great with Reloader 15.
It was the first powder that I tried with my .308 when I started reloading and I did lots of experimentation with it.
I shot mostly Sierra SMKs in both weights. The 150s had a bit of an edge early on, but as I got more practiced, the 168s seemed to get better.
R-15 is a good powder for the .308. Seemed like mine was best in the 2625 to 2675 fps velocity window with the 168s.
150 grain bullets will like it about 100 fps faster.