OP, I've taken an Aero upper/BA gov`t profile barrel out to 980 yards with a 3-9 optic on an F-class target. 77gr TMK handloads. If the barrel is a good one it will do well. Best 5 round group at 980 was 1.57 MOA, best 5 round group at 486 was .0.63 MOA. All distance measurements taken with laser range finder and calculations from range buddy app.
ETA: it shoots right at MOA with 55gr SP for under 300yd varmints/plinking, the TMKs take it to another level. POI close enough to similar for short range, rifle is sighted in for long range. 8208XBR, CCI450, LC brass, 2.255 COAL. Need to test a few other batches as I made some changes to my process that should enable greater precision. Ignore the dates, these were fired on the same day and I was just learning how to use the app and figuring out my actual dope at long range. Would love to put a better barrel on but really hesitant to change a single thing after these results. The visible holes on target are from a Rem 700 5r in .308, tough to pick out the .224 holes with that backer.
486:
Attached File980: two rounds are nearly stacked making it difficult to see all 5 impacts
Attached File