I just finished an AR308 build with an 18” barrel and an adjustable gas block.
I tried a number of bullets with Varget as a powder. The best I found was 42gr of Varget with Hornady hp/bt 168gr match bullets (1” groups @ 100yds). I understand this wouldn’t be a hunting round, but it was the most accurate I got. Most everything else was 3” @ 100yds. I will be trying other bullets to find a hunting round.