Some days, I shoot like this. You'll know it when you see it:
That was at 200 yards, rapid fire from the sitting position, with a magazine change, in a time limit of 60 seconds. For the interested, the "out to out" on the X-ring, including the white ring, is 3" in diameter. For the 10-ring, 7".
Other days, I shoot like this:
This was at 300 yards, rapid fire, from the prone position, with a magazine change all in a time limits of 70 seconds. The 200 and 300 yard scoring ring diameters are the exact same only on the 300 yard target the 8-ring is black. Why?
The "aiming black" is always 6 MOA regardless of distance. 6 MOA at 200 yards is 12" in diameter. At 300 it is 18". At 500 it is 30" and 600 yards is 36".
I don't shoot 1000 yard matches but yes, at 1000 yards, the aiming black is 6 MOA or 60" (5 ft) in diameter.