The first year I tried Turkey hunting with a bow I set up behind a blow down. A big tom came strutting in to 20 yards I drew back and smack drove the broad head right into a limb about 10 feet in front of.me. tom ran a little ways and stopped I guessed him at 30 and flung another arrow shot right under him. I had the idea that a pendulum sight was be great never have to worry about yardage again.. shot right over a nice 8 when I was 14.