Very cool tutorial. As a deer hunter when I'm practiced up I can accurately range out to 200 yards. I'm actually only comfortable taking shots out to 100 yards though. Too many variables for my skill level beyond that to be taking ethical shots. Growing up in the Northeastern US where it's heavily wooded it was rare to be taking a shot even that far anyway. I was trained first with archery, so 10-30 yards from target needed, and even while hunting with a gun I try to set up for shots within that range or near it. I might feel differently about it if the targets were multiple and potentially shooting back at me though.
It's important, and responsible, to know ones limit when dispatching targets and good to hear that's a consideration of yours.
You mention variables and that's part of what I love about long range shooting. I also cull on a big cattle farm, partly open hills and bushland, mainly kangaroo's and deer. There's variables there also, however the range is out to 800m should I deem it safe enough on a shot by shot basis. Mostly though, 100-300m.
There's so many small things that have to come together to shoot at distance and I find it all very interesting although it does my head in at times but there's a certain satisfaction of a decent stall and getting a little closer as you say...unless those deers have AK's.