All the theory is great but take a shot and see for yourself at different ranges from the tree. You can also attach some flagging tape to mark out the distances when in the stand.
Well, if you want to do things the EASY way, that's what you'd do. But where's the fun in that?[8D]
Actually, in my last post I was just explaining why .308hunter's method works, which was dohcrxl's followup question.