I have no experience shooting out of a machine, but I would expect the machine to put the arrow into the same hole repeatedly, even if the tune was off a bit. As long as everything occurs the same with each arrow, it should fly to the same wrong spot, shouldn' t it?

I do agree that the broadhead tipped arrows and field tipped arrows will most likely fly to different spots, just not a radically different spot. I see guys having trouble with their fixed blade broadheads, all the time. However, I seldom see a person tune for proper spine, or turn nocks to get best flight. It seems like most group tune, pay little attention to FOC, and just claim the broadheads don' t fly well. Like I said, maybe I' ve just been lucky, but I' ve always been able to get good groups from my broadheads, that impacted very near my field tip groups.