As an exercise I often estimate ranges using a mil dot scope. Practice on fence posts, and the like. You have to know the height of the target to calculate the range though. Targets height in metres x 1000 divided by the height in mils is the range. With practice you can be quite accurate (5_ 10%) with game though assumptions have to be made as to size and this can blow the accuracy out a bit. Still at most practical ranges it works well. One thing it does do is improve your eyeballometer and for opportunistic shots where theres no time to fumble with a rangefinder it can make all the difference.
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