Tight groups - Shaw AR-10 308 Winchester Threaded Barrel

I got my rifle reassembled with the new barrel and took it to the range to sight in. I first shot 2 light charged, bore conditioner/polisher bullets, with low expectations on there ballistic performance. To my supprize, they were within 1/2" of eachother and just 4" low.Then i just had 149gn fmj nato ammo to rough sight in with. Shot 3 in about quarter size group, 3" high 2" left,and i shot a couple more groups to get scope sighted in, but all were like quarter size groups, and all this at 100yards off the bipod of my rifle. I know thats nothing to wright home about, but compared to old barrel it was a major improvement. I still have a lot more trying it out to do tho.