I hope these are not a dull questions.

When basic tuning the horizontal & vertical planes at point blank range (3 yards). Is is best to aim at the bull using the middle pin of your sight? I cannot find any refrence as to which pin to use since there is an inch between the top & bottom pin.

Secondly. Once the above is accomplished at what range do I start altering the rest as opposed to the sight? This will be soley for the horizontal plane.