I have two very different .308s - A Browning BLR and A Tikka T3x. With the browning, I tried all the commonly recommended powders - Varget, IMR 4064, RL15, BLC2, H4895 with 168 TTSXs. The best ended up being 46.5 grains of CFE223 + FED 210 + 168 TTSXs + Hornady Brass - Velocity AVE. was 2710 FPS - pretty good speed for a 20" Barrel.
For the Tikka, I started with CFE 223 and got 2 loads that together, averaged .93" at 100 Yards - again, this accuracy load was 46.5 g of CFE223 (+FED 210 + 168 TTSX + Norma Brass). No need to go further with this.
Might be just a coincidence that the accuracy load ended up being the same for two different rifles, but perhaps not.