Rack, I understand you can get any arrow to "bullet hole" with induced torque at a certain distance, but what about if it is doing bullet holes w/o any "help" at 6-8ft.
First I would ask are you 100% sure there is no help?
And even if there is no help - again it is just a starting point. Bullet holes with fletched field tips in no way dictates a good tune for broadheads. It may be it may not be. The same point goes to group tuning field points - it does not mean the bow is tuned for broadheads. FP's are so forgiving that awfull paper tears and flight can group super tight.
I am not saying that good holes through paper are bad - just don't assume "she is really tuned because I am shooting bullet holes"
IMO you have to tune with the head your gonna bring to the game. Plumb bob, horizontal line tune, group tune and get em real tight - then forget the paper.