Re: Dual Purpose: MOA Reticle for ranging?
MOA or mils can be used for ranging, they are both just different units to measure a portion of the arc of a circle.
The math or more accurately the geometry can get a little cumbersome because we are talking about arcs of a circle and everything has a pi function in it; however, for most practical purposes a mil = 1 cm at 100m and one MOA = 1 inch at 100 yds so if you know the size of an object you can estimate its range based on how big it is in the reticle.
In use, mils are easier because everything is in multiples of 10, with MOA the math gets more complicated. Get a "mildot master", it is a slide rule for use with ranging reticles, it is worth it if even just to play with.
In the age of laser range finders I'm not sure how practical ranging with the reticle is for the average guy, but it is nice t know how to do it.
For follow up shots the whole conversation becomes pretty moot when you have a scope where the reticle matched the knobs, you simply look at where the first shot went, measure the distance off target with the rulers in front of your eye and dial a correction, or hold off, in which case it doesn't matter what your knobs are.