learn to shoot at 100 yards...when you are CONSISTANTLY under an inch THEN and only then move out further...if you are managing 2-3" at 100yards you are /should be limiting your self to 300 yards or risk wounding.
if you want to leap ahead keep some 3ltr plastic milk bottles fill them with water and see how far you can hit them.
plenty of ballistic charts/programmes out there. stick in info as best you can and go from there.
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