Re: .308 recipe
I'd use IMR4064 in a .308 case for any bullet between 160 and 190 grains. Track record for accuracy across all sorts of barrels with that powder's been hard to beat. 44 grains is a good starting point for any 168-gr. bullet. Maybe 45 if your barrel's groove diameter are on the big size like most factory barrels have been.
Berger's 30 caliber 168-gr. VLD hunting bullet needs to leave the muzzle at least 2650 fps to remain supersonic (above 1100 fps) through 1000 yards. Sierra's 175 HPMK's will do that leaving 100 fps or more slower. But the Berger's a better hunting bullet; especially at the longer ranges. Sierra's HPMK's may not expand reliably.