I agree with this and using the reticle as a reference dimension.
I'm trying to understand the theory of the system as it is applied. Its essentially metric (
https://en.wikipedia.org/wiki/SI_derived_unit), but it appears common to mix in yards and inches when describing distance, height, or any other dimension when not looking through a scope at a target. From a science/math viewpoint, its sloppy and not intuitive to mix units. Not saying its better or worse, just want to understand what the state of practice is.
I think marbles cleared up the this motion of metric and mils. This motion is akin to a carpenter using a tape measure in metric only for commercial construction on sundays….
Mil AND Moa are not a measure of distance. They are measures of degrees from a reference. Think if a protractor or a battleship gun turret. If the battleship needs to hit a target at two miles the turret will be slightly elevated. If it needs to hit a 20 mile/32 kilometer then the gun turret will be elevated higher from its axis or reference and the 2 mile target position. Thst can be measured in degrees or moa or mil. But the turret elevation will be the same regardless.
The value of degrees is different subdivided in moa vs mil if degrees. This only affects how many clicks to get to the same solution, or elevation of the turret in above example.
There is zero need to figure in inches or cm the drop of a bullet to target once known, and then moving clicks to that drop. That is something to forever cease considering. Once distance is known, your app/kestrel/rf bino/dope card etc already have your “verified “ ballistic curve programmed. You’re simply taking zeroed poi from 100 yard zero to move the gun barrel up to the new distance. No conversion is need in any system once the distance of target is known. Dial snd shoot (assuming zero wind

).
Both degree systems will give you same results.
The commentary by some, including me is that using mil scope can be quicker to dial and shoot a solution vs moa given a streamlined number of steps. Specifically accounting for wind holds in that math for most is easier in base 10 vs fractions and the g1 bc if your bullet corresponds to a wind bracket which predicts .1mil drift per 100 yards. (See detail earlier in thread).
Its this later wind hold determination that may be quicker, not spinning the turret and anything involving measuring inches or cm.
Some, here feel they are equally fast in either system, ie the wind hold. Both easily handle distance or elevation.