This is an ongoing argument; folks that use MIL/MIL setups say it is superior; those that use nothing but MOA/MOA say it is just a good as MIL/MIL; interestingly nobody argues that MOA/MOA is superior system.
There are a few reasons for that phenomenon, I'm going to list them, so those who have not used either system can judge for themselves.
1) Spotting scopes with reticles - Most of the spotting scopes that do have reticles, are graduated in MILS. So if your ever going to have to use a spotter, like in a match or in training, your MOA/MOA scope will be speaking a different language from your spotter.
2) Memory - Although many shooters have drop tables plastered over various parts of their rifle, and/or data books with comprehensive tables and/or a smart phone in their hand, for all ranges to be encountered, many of the better shooters actually memorize their gross drop points, for speed, out to say 900 yds or so.
So which is easier to memorize; This:
200 | 0.0 |
300 | -0.8 |
400 | -1.8 |
500 | -2.9 |
600 | -4.3 |
700 | -5.9 |
800 | -7.8 |
900 | -10.1 |
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Or This:
200 | 0.0 |
300 | -2.7 |
400 | -6.1 |
500 | -10.0 |
600 | -14.7 |
700 | -20.2 |
800 | -26.8 |
900 | -34.6 |
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So which sequence of numbers (top is MILS, bottom is MOA) is easier to memorize and less likely to be forgotten under pressure??
3) Precision - Looking again at the two drop tables, which are for my 5.56MM 77 Gr Nosler CC @ 2700 FPS, come directly from JBM Trajectory Simplified, which is a common resource tool, and one that is emulated in many smart phone apps.
So if your using MILS, and your target is 600 yds away you dial or hold -4.3 MILS exactly. It is no problem with the common 0.10 MILS (or .1 CM) per click scopes which encompass 99% of the MIL based scopes available.
On the other hand, if you have a scope that adjusts in MOA and your 600 yd hold is -14.7 MOA. Guess what? There are no MOA scopes made that can dial exactly 14.7 MOA. They can dial in 0.125 MOA or 0.25 MOA or 0.50 MOA or 1.0 MOA increments, but none can dial in exactly 0.10 MOA increments.
So you can dial above that number or below that number, but you still have to think for a micro second and make a choice of going some amount above or below the exact number your supposed to dial. It's small thing, but it does force you to think and make a decision about something other than just dialing and shooting at your target, whatever it is....
4) Reticles - The vast majority of MIL based reticles measure (subtend) in either 1 MIL or 0.5 MIL increments via a series of dots; dots and dashs; or just dashs. They are very simple to use and understand with a modicum of training.
Not so with MOA reticles, which are in different graduations, and those graduations are sometimes expressed not in MOA but SMOA (or IPHY) which is a similar system, but not identical.
5) Dials - Again MIL dials mostly come in 0.1 MILS per click, though there are a few that come as 0.05 MILS or 0.2 MILS per click they are very few.
MOA dials come in 0.125 MOA, 0.25 MOA, 0.50 MOA, and 1.0 MOA, increments and some are not MOA at all but SMOA (IPHY). Which is close, but no cigar...
MILS is a standard, MOA is a concept that is followed by some makers, but not all makers.
So there you have it. Whatever advantages, abet small that there, are all accrued to the MILS side.
Training and experience with MOA can alleviate most of these "advantages" that a MIL based shooter gets for nearly free. But it is incumbent on the shooter and chooser of an MOA based scope to get that training and experience and put in the time....There are no free lunches when you pick something that has no standards.
IMHO and YMMV