I thought you were asking for references....haha, my cousin, great hunter, with a rifle/shotgun, never misses, for the most part. But bow.....he's had every bow, sight, etc.....finally has begun practicing from an elevated position, still misses deer all the time, I don't think he has a bowkill yet! after quite a few years of bow hunting, has taken shots etc....I think when that deer's at 30yds, he gets excited or something.