New at long range shooting, what would be considered an acceptional group at 800-1000yds?

[WildRose]

As an earlier post explained, your 800yard group shows low vertical dispersion. This means you are likely getting similar velocities from shot to shot (this is excellent). The horizontal dispersion is on you. Those are wind-call errors. Learning to call the wind is probably the most difficult thing to master in longrange shooting.

True but there's a lot more to it as well starting with basic marksmanship skills, how steady you are behind the gun, and how well tuned your trigger is etc.

Someone with a better math brain than myself can do the math but consider this, a horizontal wiggle that moves the end of the muzzle just a few millimeters between the time you start the pull of the trigger and the bullet exiting the bore will induce a huge error downrange.