What is your zero? What is the farthest you expect to shoot?
I shoot a 6mm Norma BR. with 105 gr. Berger VLDs and my zero is 200 yds. At 300 yds. the 105s drop 8 inches below my zero and at 400 yds. they drop 21.5 inches below my zero. These were shot from "MY" rifle. These numbers did not come from any computer program the groups were measured on the targets I used. If I didn't get a custom turret I would have gone as far as I would shoot measuring the drops. This way I would have confidence in my drop chart.
The computer programs are only as good as the info that is put into it. Your actual ark of your bullet going down range shot from your rifle is the most critical info. All the other info needed to produce the ark or a custom turret with a computer program can be verriable. When I gave my drop measurements to the turret maker he adjusted the other info to match my ark of the bullet.
This is something I would consider when making your drop chart.
When I tested my new custom turret it was "dead nuts " accurate. And it is accurate all the way out to 900 yds. which I shot out in Wyoming.
Testing new Vortex custom turret. - Georgia Outdoor News Forum
PS: If you have filp up covers like Butler Creek on your scope you could tape your drop chart to the inside of the cover so when you open it it will be right in front of your eyes instead of on the side of your stock.