Here is what I came up with, using the first yardage no. as the base line:

6" x 27.8 ( constant rounded up) divided by no of mils seen (.5) = 333 yrds.
Now change the mils seen by just 1 tenth mil and you get,
6 x 27,8 divided by .6 mils= 279 yrds, or
6 x 27.8 divided by .4 mils= 417 yrds, and so forth...So the closer you can divide a tenth mil, like into half or quarter tenth mil, as I under stand an experienced Sniper can do, the closer the correct yardage will be.
I as yet can`t do it, and live animals do move, even those at 3-4-500 yrds...so the LRF is quicker and more accurate.
I didn`t understand how close one needed to measure a "known" object. I do now. But if your in to it, it`s fun stuff, and if you do have a field full of deer, it`s funner!