cayugad,I have also had that heart shot go 100 yds year before last, I believe if you hit the heart it releases all the adrenalne in the body and they run wide open as long as they last. Since my property is covered with brush and woods I try to place my shot well enough to see where they drop but the same spot gives an excellant blood trail shooting down from a high tree stand,its always noticeable that the blood trail is on the lower exit side to. Lee