Those disciplines are typically shooting paper, at distance, for groups that are frequently measured with calipers to the thousanth of an inch. And they have all the time in the world as compared to other shooting disciplines, often ten minutes for ten shots. They can choose to use all that time, or “run” when they want to get off all their shots before the wind changes directions and/ or velocity. For my purposes of shooting during hunting and during dynamic, moving type rifle competitions (P.R.S.) I have no use for MOA. I know what it is, I know how to use it, and I know how to teach it. But I don’t want it. Many may ask “why” and my answer is ease, and speed.
or meters. People like to say “I think in inches and yards, so I should use MOA”. NO! We are talking about dividing up a circle, these are measurements of angles like degrees are, not measurements of distance (linear measurement). Neither system has anything to do with inches or centimeters. (We call 1 MOA 1″ at 100 yards, 2″ at 200 yards, ect. But in reality those are rounded figures. 1 MOA at 100 yards is actually 1.047″) Elevation correction is not the problem, gravity is easy to correct for. With either system (Mil or MOA) we use a ballistic calculator to give us a predicted trajectory. We input caliber, bullet weight, ballistic coefficient, muzzle velocity, and rate of twist, we tell the calculator to calculate, and it produces predicted trajectory corrections in what ever triginomtetry function we told it to, i.e. Mil or MOA. We told the calculator we wanted corrections every 25 yards out to as far as we want to go. Then we go out to the range and confirm, or deny, if the predicted trajectory is correct, or not. (In the class I offer, I teach how to adjust as needed to make the calculator be something a person can rely on). So the calculator was set in MOA, and we are shooting a 6.5 Creedmoor, with a 140 gr. A-max, that has an MV of 2800 fps, and is zeroed at 100 yards. And the calculator tells us this:
300 -3 1/2
400 -6 1/4
500 -9 1/4
600 -12 1/2
900 -24 1/2
1000 -29 1/4
We (the shooter and the wind) are effectively throwing curve balls that cross directly center over the plate, err the target. Now it seems like there is a whole bunch of thought process happening, and there is. So when it comes down to the point of when seconds matter, here is where Mils shine over MOA.