Never tried it like that, you are talking about taking a previously shot pattern and adjusting the scope to that at 15 yards? I don't know if it will work or not, never thought about it. If you decide to do it as you hold your point of aim on the target, I would get someone else to do the adjusting of the scope. Probably will be more accurate. If you do it be sure to keep us posted, as to if it worked or not, it would be interesting. Maybe someone else can give you a more definite answer, Good Luck.