I shoot out to 1400yds regularly and know my gun. A dope card will get me out to 500yds, anything further and I'm using real world data for those conditions.
I live at 5500' hunt between 9000-11000'. When I make my drop charts, I make them for 10000' and only out to 500yds. If I need to shoot farther, I'll take a kestrel reading and use my vortex AB 5000 rangefinder to get a shooting solution.