I read the post about 4x, but it still does not make any sense to me. If I read you correctly, in your experiment why don't you want to set the parallex correspond to the correct yardage, having the parallex set on 300 for 100 yard target.... what's the idea behind that?
BTW, I never go by the yardage index on the scope, it's mostly for reference only, I aways adjust till the crosshair stop flowing in the sight then I fine tune the eye piece till the sight picture is crisp/sharp.
I also find that it does not have much affect when PD shooting, the crosshair does not flow enough to come off target but the mirage is what I have trouble with.
