The Mil-Dot system provides a system for range estimation. If you know the size of the intended target, you can count mil-dots across the target to determine the range.
The formula is: ((target size (yrds) x1000) / # of mils that cover the target) = yards to target
You also can use the mil-dot to determine a hold-over, provide wind hold-offs, and to engauge moving targets.
I installed custom knobs calibrated for a specific ammo. Therefore, I don't have to "count clicks" after determining the range, I just dial up that number. Most people use the hash marks and know the number of clicks per full rotation instead of counting.
If I am using a ammo different than what the knobs are calibrated for, I set up my drop table to still reference the knobs. For example, if a ballistic table tells me the ammo is 0.5 MOA different at that range, I goto the same range on the dial and subtract or add two clicks.
However, without a mil-dot recticle, one still needs to determine the range using some method.
Edited by Boomholzer