If you only have one long range gun I know a cure for that.
I would recommend taking some 338 or 30 cal or 6.5 pills and go shopping in the morning .
Weather 1 or 10 even with out a computer it will work great.
I have been working with Ballistic software and devices for over 20 years and have tried just about every device and combination of devices.
I shoot 3 gun and long range competition and have hunted in Wyoming at some 700 to 900 yard shots.
Last fall one of our guys, " Buzzy " took a Bull Elk @ 1111 Yards with witnesses to prove it and Last fall my Team Mate Jake & I won the 100 to 500 meter Match at Ft. McCoy with reactive Body Size targets and took second on Sun out to 1000 meters.
We have a 1000 yard range we can do development on at our disposal and we have learned a lot over the last 20 + years and have even more to learn over the next 20.