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There are many factors that can affect the POI using a scope that high power at that distance. 1. Mirage, probably not the problem but a possibility. 2. Parallex is a probable culprit. 3. Mechanical issues with the scope are also very likely.
My Leupold bench rest scopes have spent a lot of time on the UPS truck going back to be rebuilt because they just would not group like they should. I have a Leupold Mark 3 that has to settle in when adjusted. It takes it 7 or 8 rounds to settle. It is on a hunting rifle, so it is not worth the aggravation of sending it in to have it fixed.
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