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We watched that again this week during the snow. It still holds up well for a 25(?) year old film.
It is rooted in demonstrably science.
K.I.S.S. that is the theoretical principal at play here (AKA simplicity principle). Seeing as you are arguing for a theory base and that real world data points don't count. Personally, I prefer the other way as theory often gets things wrong (geocentric gravitational theory for example).
MOA (as used in shooting) is a hybrid system of base ten and base four (it actually goes back to the Babylonians and a base 60 system with 360 degrees, 60 minutes, and 60 seconds).
Switching between base ten and base 4 is inefficient and requires more brain power. Put differently, it is not an ergonomic system. It is why most people say 'a dollar twenty five' rather that 'a dollar and a quarter'. Or, 'a dollar sixty-seven' rather than 'a dollar, two quarters, a dime, a nickel, and two pennies'.
It doesn't matter how much you practice, staying in the same base system will be more efficient. That is simple psychology and ergonomics.
In psychology it would be said tha MOA is a higher load, and mils is a lower load. This is support by multiple people finding that switching to the low load system improved their performance.
No, zero at 100, then dial to MPBR for walking around is most efficient. After all, you get the advantages of both without the drawbacks of either.
If you really wanted two, you could zero at 100 for easy math, but set your zero stop for the MPBR.
I'm not saying real world experience doesn't count. I'm saying that when the grand guru of the forum says the difference is incremental then some other guy says the difference is night and day, there needs to be some reconciliation there. And the base four aspect of MOA isn't a given nor a necessity. We could use 1/2moa or 1/5moa adjustments just as easily (not sure why, though, as 1/4moa works fine). Again, dividing by 4 isn't *that* hard, and isn't even needed for elevation, nor wind. I've demonstrated that well beyond certainty in this thread. Nobody needs to think in fractions of MOA - just dial the turret to the spot between your 300 and 400 yard marks for a 350 yard shot. Whether that's 4 clicks or 24 or 31 doesn't matter.
Having said that, I will happily note that you are maybe the second(?) person in the thread to appeal to the psychology aspect of this, and the first to make any significant attempt to flesh it out, and that is admirable and worth applause. Thank you. It's a start. It's not a finish, but it's a start, and if we ever got to the point of making an exhaustive list of the reasons y'all think mrads are superior, we could put it first, and perhaps have a different thread where we focused on that. If we do, I'm going to posit that one of the goals of training is to teach people how to do things under stress and you can actually train people to divide by 4 under stress (again, if you needed to, which, again, you really don't, since nobody is counting clicks here or being forced to count in wholes-and-quarters when they could just use some form of yardage turret system as I have explained before). But that could be another discussion in another thread. To reiterate, I appreciate the attempt to bring up the psychological aspect. Thank you.
As for zeroing at 100 there's nothing efficient about zeroing then having to dial. Because now you have two 'base' numbers. After a shot do you dial back to zero or dial back to the MPBR mark? Which was it? Think fast, you're halfway to the deer and it jumped up and is trying to run. I really prefer to have a single 'zero' range and never have to think about it at 0-300 yards or so, which, again, is the vast, vast majority of where I, and the vast, vast majority of others, actually shoot game. Approaching this from a triage standpoint, which I'd hope you'd appreciate as you seem to have some sort of med(?) background, if I'm building a model for a shooting solution, I want it to be the strongest where it's going to get used the most.
Point being, that 'just dial to mpbr' introduced the sort of uncertainty you're seeming to want to eliminate. Also, I'm not sure how to set a zero stop (on most scopes, anyway) to 'stop' at ~3moa above zero without hindering it from dialing even further when needed.