If we're talking extreme ranges, and first round hits, the verbose and mathematically intensive stuff is the ONLY viable answer. Litz's Applied Ballistics is really good, really any of the above mentioned training is still going to be cheaper for reaching that ultimate goal than sending lots of rounds downrange and trying to figure it out.
Building out towards that range is a big part of it too - I remember working out towards 550yd incrementally really helping, I copied exactly as much as I could with my medium range precision carbine stuff, but I have at least a limited appreciation of the scope of stuff I don't know and some idea of how much I don't know I don't know moving out past 1km. To be honest, consistent hits at 600-700yd is probably all I'd be good for with sane equipment in 95% of weather conditions, but that's not actually that trivial, especially if there's some UKD as part of it.
عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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