Sounds to me like you've answered your own question then. A 150 gr .30 caliber bullet at 2700 -2900 will do most things requested of a .308, and if it tends to shoot better when backed by 4895 type propellant then a heavier bullet, why look further? If you're set on heavier bullets, try a 175 or a 180 backed by 760/H414. Pin point accuracy, although comforting to the marksman, and a point of pride to the rifleman, isn't a requirement of a rifle that is to be used to hit a 12" target out to say 300 yards though. If you want fast, try a 130 gr TTSX backed with 4895 or 748.