well imperical testing personally my 10 42mm scope with the parallax adjustment at 100yds, i can move around behind the scope without changing poi/poa, but if i turn and aim at something say 500yds out, and run the same test the target verses retical moves around about 6 to 8 inches. and it gets worse at longer ranges. and if i adjust out the parallax at 500yds then aim at a 100yd target and run the same test it moves around about 1.5 inches.
that's all i know, just what i see in the scope.
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