I have no real group size to show, but I went out on Sunday and was successful with my m1a at 800 and 1000 yards
Video of 800. The shot is at 0:10 and if you listen very closely you can hear it ring the target at 0:13.
That was shooting 175gr match ammo. I believe it took 5 shots to get on target then there were 3 hits in the next 5.
Backed up to 1000 yards and tried my luck. Ran out of match ammo after 4 shots. Had 20 rounds of Pakistani surplus (POF) and ill be damned if I didn't score my first 1000 yard hit ever with paki surplus! I only had 1 hit with that stuff. Too man flyers. I was reading and adjusting my point of aim with my 'good' hits (most were dancing around the target frame) but every 3rd or 4th shot would hit like 3' away from the target.
Then I had 10 or 12 rounds left of lake city surplus. I scored 3 more hits with that stuff! I was impressed. I know most surplus ammo can be 2-4 MOA. That's a 40" group at 1000 yards!
Anyway, here's the target. 18"x24". The 4 spots with splatter around them were the actual hits. The other 3 marks are from ricochets hitting below/in front.