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Mil reticles are useful because you can tell how far a target is from you through the following:
Size of target x 1000 divided by number of mils the target covers.
Another way to put this is:
Height of the target in yards divided by the height of the target in milliradians multiplied by 1000 equals the distance to the target in yards.
An example would be someone estimated to be 6-feet tall (2 yards). The top of his head lines up with one dot and his feet line up four dots down. So: (2/4) x 1000 = 500 yards away.
With most adjustable scopes you use the elevation knob to dial in the bullet drop compensation for the distance and use the horizontal mil scale to hold past the target for wind drift or to lead the target. Once you know the distance, you can easily compensate for leading or wind drift because the mil scale distance between dots or marks equals 3.6-inches at 100 yards (36-inches at 1,000 yards). It expands equally so that 200 yards is 7.2 inches, 400 yards, 14.4 inches, etc.
MIL scales are most useful if you are using a first focal plane (FFP) reticle scope. With the FFP scope, the Mil scale covers the same area at any magnification. They are a bit disconcerting to use at first as the reticle size changes as it is proportional to the amount of magnification, unlike a second focal plane reticle that always stays the same size.
As for repeatability - that's a function of the scope construction. I use a US Optics 3.8-22X scope. Once you know the bullet drop for the ammunition you're using, the scope adjustment is repeatable for any distance. You do not have to "dial past" then "dial back" - you simply dial in the amount of elevation change needed.
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