The mil dot scopes are great for quick range and hold over estimates. Knowing how your scope is calculated is key. I got all messed up when I purchased a fixed 4x mil dot scope. It did not relate to my 10x scope. Your scope should come with a calibration and mil dot specs. Between chairgun and Ted's holdovers on you tube I was able to figure out the difference between the different magnifications I. Relation to the mil dot.
Basically a mil dot on 10x is 3.6" front center to center on the dots. So a known target of 3.6" will fill space between 2 mildots center to center @ 50 yards eft eft. With different magnifications this changes. My scope came with a formula. More or less it substitutes the magnification 10x for 4x. Works good for hunting squirrel. With a quick steady look I know how many yards throw ctitter is away. Also I know by my pellet and velocitiees which holdovers/under to use. I'm just getting used to useing the mil dot for windage holdout eds.