Mil-Dot

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To find range to your target, you could make use of technology and use a scope with integrated laser rangefinder like the Burris Eliminator (bottom.) Or, with some basic math, you can use a scope with a graduated mil-dot or MOA reticle like the Burris Veracity (top.)

Optics Buying Guide: Finding Range With A Scope

You can figure out how far away an object is using your scope, provided its reticle has markings in mil dots or minutes of angle.