Was that target fired at 100 yards? Is that an SR-1 target (200 yard target reduced for 100 yards)?
If so, the group near the center is 1 MOA wide but 3.5 MOA tall. Wind is not a factor at 100 yards. Were you flinching to cause the vertical dispersion, or were you dialing in it, or what?
1 MOA wide is pretty good for ball ammo. Is that what you were using or was it reloads?
The group is about 1 MOA left of center. At 1000 yards, that is almost a foot left of center. I'd suggest you center the group a little better.