Part of estimating range is knowing the size of some object in the distance. I have found, that if I hold my hand fully outstretched in front of me, the width of my left thumb is visually the same as a 12 feet length at 100 yards. A dime held outstretched is about 6 feet. So if I see a man standing at some unknown distance, I assume he is 6 feet or nearly so... I hold up my thumb. If his height is half the width of my thumb, or dime-size, he is 100 yards. If he is 1/4 the width, he is 200 yards.
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