And this is the problem.Agreed. Past 600 yds a lot of things can happen. The farthest I've shot an elk was 606 yds. Everything else has been under 500.
I only shoot when I have a tag in my pocket. I don't shoot recreationally.
I will shoot my rifle at a target 500 yds out for piece of mind a week or two before I go. 3 to 5 shots for muscle memory more than anything else and refamiliarize with holdover using a BDC.
A scope with external adjustable turrets made for that application would simply eliminate the holdover, and drift if applicable. I don't need to practice regularly. My anecdotal evidence applies to many out there, they just don't post on hunting forums...