Hey Toklat-- welcome. My suggestion is to go to the website that Optics talk has put together for mil-dot users right here-- www.Mil-Dot.com that gives an excellent breakdown on how to use "the system." The pic of the mil-dot on that site is the oblong dot that the USMC developed. Yours is probably the round dot that's similar to the Army's system. There is a difference that's important to note. If u go to the Leupold site, and access the reticle pg. it will give u a breakdown of the mil-dot that they're/you're using (the dot diameter is .2 mil).
If u're interested in applying any reticle "tactically" for downrange zeroing, windage and ranging here's another reference souce u may be interested in-- www.ottllc.com/specialtypistols/sp20.pdf
Another excellent source of reference for manipulating ballistic/ranging reticles for downrange zeroing only is right here www.burrisoptics.com /Tech. Notes pg.
Whether u want to apply the reticle for ranging, windage, downrange zeroing, or moving shots is up to u. There r advantages to every system, and depends mostly on your application of it.