I've got 220 rds through a DPMS Oracle, 16" pencil barrel, 1:9 twist.
I've run 3 types of ammo through it, all 55g. Off a good sandbag bench setup, at 100 yds, I got these results:
Freedom reloads, groups avg ~2.5"
Brown Bear, groups avg ~3"
Tula, groups avg ~3.4"
What factory ammo do you...