Max an approximate but quick method is to use the known subtension in moa or mls between crosshair and the part where the crosshair becomes thicker. One one of my scopes if I zero at 200 on the crosshair, I can use the upper fine to thick junction of yhe verticle as an aim mark at 100, and the lower junction for 300. If you mark a target set up at 100 and clearly mark inch or cm gradations on it, then take scope back to 100 and take note of where parts of the reticle intersect your measured marks at various magnifications you can easily work out an approximate scale. A typcal red hind has a depth shoulder to brisket of about 18 inches, )18moa( at 100, or 6moa at 300, Knowing your subtensions relative to the object size you are aiming at can give you a pretty good estimate of range prett y quickly..
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