alpg88 - i dun own any scopes
let alone a shooting scope ....
oh, ok.
there is another way, when i was in school on our military class (yes my school had that class) teacher (retired navy major) taught us how to make simple rangefinder out of the cardboard, it was piece of cardboard iirc about 3x9in or co, inside was long right triangular slot, with notches marked along the Hypotenuse-Leg, we had to practice to hold it at 50cm away from out eye, the idea is the same as range finding reticle, knowing size of the target you see where within triangle slot it fits, from there you see the range, it was not too accurate, it worked for up to 300m with accuracy give or take 10-20m. iirc it was very easy to make our school notebooks had square graphs 5x5mm,
i just spend good 2 hours googling, but found nothing, (it took a lot less time to make one, lol) who knew i might need that 25 years later, i'd save one, but i'm sure anyone can do it, piece of plexiglass, marker, and a helper or a broom stick with a highly visible circle on one end, just mark where his head (or circle) is relative to a line on plexiglass, or its edge, 20-40-60-.....300 or more yards away. in school we were given diagram, but you will have to make one by measuring things yourself. it wont be extremely accurate but you cant find cheaper rangefinder.