I use 45 grains of Alliant Powder's "Reloader 15" under a 168 BTHP Sierra Match King. I'm getting sub-1/2 MOA with it under optimum conditions...

When I first obtained the rifle (a Remington 700P) I purchased a case of Remington Match .308/168g BTHP ammo, and a Leupold 3.5-10x50 VXIII scope with target turrets. I zeroed for that round and that lot number of ammo. I saved all of my brass, for I knew I would be reloading later. I worked up my load with RL15, re-zeroed the rifle, and have been using that load ever since...

Regards,
Mike