What I think your issue could be is parallax error. Are you making sure you are 'dialing out' properly at the ranges you are having trouble with?
(For newer shooters)
Before shooting any new range you need to re-settle the crosshairs by unfocussing back and forth, in small increments. Bobbing your head till you confirm that your crosshair isn't straying off the target 1mm.
If you don't do this you're at the mercy of the variation in your hold. It will blow out your groups. The error is almost imperceptible because your scope eye auto adjusts. But the crosshair wobbling when you bob your head a little tells you your focus is OFF.
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