I just recently got a new string on my bow I had it paper tuned so there were only bullet holes. When I put on muzzys everything went haywire. I then bare shaft tuned it and I could shoot 20 yards and group right with the field points but the broad heads still would not fly. So I started shooting 3 broadheads and 3 field points. I kept moving the rest until they all hit the same spot. Just my 2 cents but I feel tuning is over rated.