On the FAST, I generally have a really refined sight picture for the first two head-shots. Practicing for those head shots by drawing and firing two shots at an index card has actually really benefited my ability to call my shots on any given target as well. Confidence on shooting the card increases my confidence in engaging targets at intermediate to long range as well. I no longer fear the 25 yard pepper popper, because if the front sight is there I'll get the hit.