It shoot's ok with the 168's at mag length but when I tried to go heavier I just never could find a good node. The factory .308 barrel has proven itself to be very finicky. There is no factory ammo that I've ran through this barrel the will perform to 1/2 MOA no matter what the bullet weight. Although I have found a few of my hand loads that perform very well. This is an early factory Krieger barrel. My 300 Win Mag barrel on the other hand shoots well within the 1/2 MOA guarantee with factory match ammo.