good post EJR, and remember if your guessing the size of the object your milling then you might aswell just guess the range instead. "hes about 5'6'' tall" is gonna be likely less accurate then "thats about 410 yards". Thats why its good to try to guess ranges and then use a range finder to see how you did. me and a friend do it a lot and we are usually quite close, especially when we put our heads together to decide on a range.