27.77 is a pretty specific number. Mind if I ask where you get it from?
Forgot I even created this thread, but I have come up with the answer, and it was much simpler then that IMO. I went out to Ft. Bliss Rod & Gun Club where they actually have a 1,000 yd range. Set up a 36 inch piece of cardboard painted white leaning against their steel. When I looked at it with scope at 8X it did indeed cover 1 full Mil. Zoomed to 16X, it covered 2 full mils, and covered 3 mils at 24X.
So, if a 36 in target covers 1 mil at 8X and 1000 yds, a 6 ft man will cover 2 mils at the same range and power, or 4 mils at 16X, etc. A little more work involved if you want to use any of the in between powers of the scope, but if you increment the power, 8X to 16X, to 24X, it's simple as dividing what you get by 2 or 3 respectively. But still requires you to know the rough size of the target.
Would like to know where you get that number from though. I'm a curious sort of person. LOL
There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter.