I also do a lot of long range shooting, from PRS matches to long range hunting. For competition, i have Sidewinder dope cards that velcro to my actual chassis and are flexible so i can see them when behind the gun:
https://www.shortactionprecision.com...pe-card-holder. I like these because i can make a specific card for each stage, that only has my dope for those distances, so there isn't too much information clutter. But you could keep easy dope from 200-1,000 in there for each rifle.
For hunting, i use a quarterback arm band that has my specific dope for that gun out to 1,200 yards, including dope for 10mph wind holds. Like this
https://www.dickssportinggoods.com/p...3wndwwstcchftb