I suspect wind might be slightly more of a problem than vertical angle of attack...
If you take a circle and tilt it back at 45 degrees, you would reduce the target size when looking at it through a scope.
If I read that report correctly, they say 2 MOA windage. THAT is what I find pretty hard to believe over that type of distance. They are also talking about shooting over a canyon, so you are most likely dealing with higher velocity wind...
1 MOA target thru a 20x scope at 3000+ yds is not aimed, repeatable shooting...
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