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A typical (stadiametric) rangefinding reticle used by military snipers. The Mil-dots can be seen on the cross hairs. The four horizontal bars over the horizontal line are also intended for (quick) ranging purposes.
If the helmeted head of a man (≈ 0.25 m tall) fits between the fourth bar and the horizontal line, the man is at approximately 100 meters distance. When the upper part of the body of a man (≈ 1 m tall) fits under the fourth bar, he stands at approximately 400 meters distance.