If starting with 100 yd =o then 200 is 2, etc. 400 is 4 MOA if 4 clicks equal 1moa 4 moa is 4x4 or 16. The other people are possibly using a different 0. What is confusing is this concept is a radial system assuming straight lines which no bullet trajectory follows (it's progressive). like the hand on a clock with a 1 inch dial measuring 2,3,4 inch out. No any rangiing reticle (mildot is just one type) uses a triangulation method for distance determination, and some known measurement Laser RF use a clock and frequency.
