you can go very simple with a 6.5 CM as a ~600 yard hunting rig, I like the studying of ballistics scenarios you are doing to get the 40,000' view of your gears capability, keep going with that, run all scenarios you can and compare the changes at 600
find your elevation range, low to high, find your temp range average over the seasons you hunt, run your ballistics every 1000' from your low to high ranges
you'll start to notice a pattern that you'll only be out 1-2 clicks at the outer distances at the most extreme ends of your shooting ranges and temps...not an issue for big game kill zones is what you'll see if you set up in the middle, coyotes at 600 at lower elevation and -30 degrees yes you will likely be out far enough to just scare them, sheep up high at 600 in the thinner air you may hit a couple inches high...not a biggie
then as you start shooting more, no matter how accurate the rifle may be it will almost always be more accurate than you...you will discover that you have a pretty repeatable field accuracy for 3 shot groups of say 3/4 to 1 1/4 moa which will more define your distance limits on game than the atmospheric conditions, a lot of shooters will land in this range and that's part of the reason you find a lot of shooters have similar 600 yard upper limits on game etc. I'm pretty good with 3/4 moa in the field for 3 shot groups most of the time so happy to play within those practical self limits, I've found the past 15 years I can do all of this with factory rifles and ammo to boot, and so I do
in Alberta where I live we can hunt prairies to mountain tops, pronghorn to sheep, my typical shoot range is about 3500' to 8500' (26-22 inhg), we coyote hunt in winter also so lower elev. and colder temps, so fall/winter average daytime highs over that period end up around 41f or 5c and running the dope to be within 1 or 2 clicks out max in most scenarios landed me at baseline setup of 5000' or 25 inhg and 5c temp (just set humidity at 50% always, it won't be something you have to worry about)...so set and forget, have your holds or your dial up to match that middling average and you don't need ballistics calcs or programs or anything complicated while actually out there, I have tested this dope set up on single cold shots afield from 575-700-930 yards and still would have killed whatever imaginary sheep I was testing at, it's actually easier to over compensate a correction click or two thinking you're higher than you are or it's colder than it is and put yourself further out than had you just not trusted the middling data to begin with, ie' I backed off a couple clicks (or 4.5") on a 930 yard test shot thinking I was closer to 9000' across that basin and landed 5" low of point of aim with those 2 clicks, had I trusted the data and my initial set up I would have damn near hit perfect, I was lower in elevation than I thought in that example, felt I had climbed much higher lol and it looked much higher, a 700 yard I took was perfect and I didn't try to over think a 1 or 2 click variance, so set up to 600 will be very close and well inside kill zones of big game without needing any help from gear, ballistics programs or brain power to be effective, a simple rangefinder and understanding some wind reading and freezer will be full
after that your best use of time will be to develop your wind strategy, again study all the speeds, the averages you're likely to encounter, combined with your experiences while shooting on steel etc. you'll see how you may want to deal with wind, whether it's reticle reference, or hold in inches from target reference...the data you see will guide you there as well, aim for simplicity and most likely to revert to subconsciously when you go on auto-pilot as we often do when it's time to close the deal on real animals
and yes on shooting at distance yourself, you'll wanna spend time shooting steel ~500 yards to see what your abilities are and your comfort levels will come from that, if you can hover near moa for 3 shot groups routinely at 500 a 600 will be similar, you don't have to practice at your outer limit distance to know but you want to be very confident at 75-80% of that