Moore's Machine manufacturers AR Stoner and BCA barrels. About 1/2" 3 shot groups(3 different bullets so far) has been what I have been seeing with my 18" BCA.
Do you know if sateen barrel is still in businessI have two of them. A 6x45 20" stainless and a 223 Wylde 16" straight flute stainless both are 8 twist. Both have been excellent with almost zero copper fouling. I shoot the 50 vmax in the 223 with no issues and 55 BT, 58 Vmax, and 70 BT in the 6x45. Both barrels are close to .5 shooters. The 6x45 with 70 BT's is almost a one holer.