+1 on the heavier bullets. That rifle has a one in ten twist and may not like the lighter 308 bullets. 168 should shoot in it or even heavier like 175-180. If you don't reload, federal gold medal match is good ammo to try. Most of the time people point straight to the gun as the culprit when it won't group and usually it just doesn't like the bullets being fed to it. This is why a lot of us on here reload. It's cheaper more consistent ammunition and you can tailor it to a gun or situation.