That's because all the tactical guys ditched moa over the last 15 years. Even Leupold took nearly a year after the mark 5 release to bother with an moa model.
Here's the key to it all. You measure with the ruler you're looking through.
Miss 2 mills low? Bring it up 2 or dual the turret 2.
A $15 app like strelok pro, get your info in, get it trued to your ammo, and it'll spit out perfect dope.
Quit thinking in inches, just think "I need 28 mills of elevation to hit at 500", instead of 96 moa, with 4 clicks per.
So you dial 280 clicks instead of 384.
(Yes, that is my dope for 500 with the .22lr and sk lrm.)
the only time you need to use inches and convert is when you are ranging. 12 inch target, dont know its distance, but the scope shows you its 0.5 mils. 12 inches x 27.77 / 0.5 mils = 666 yards
27.77 is a constant
or you can do
12 inches (divided by) 3.6 inches per mil per 100 yrds (divided by) 0.5 mils * 100 = 666 yards