During bow season, I have all my " possible shooting lanes" mapped out and can make all the shots with my top pin....this weekend there is a 3D shoot, and the targets range from 20 to 50 yards. I shot the coarse today (my first time shooting 3D) and I was off on almost every target.I wanted to know if there' s something that would help me judge distance...I found that the terrain and type of target really effected my judements..I shot an arrow at each target, used my rangefinder to check the distance , and shot another arrow.....I usually shot better on the second arrow...their going to move the targets before the shoot, so I will probably shoot as bad or worse.....anyway, thanks for any advice.