From the Ballistics Calculator on the Federal Premium Ammunition website. I had a friend verify on his ballistic app also. It's adjusted for 45 degrees F, 2000 feet elevation, and 20 fps less than published data for muzzle velocity based on a 23" vs 24" barrel. I'm comfortable with its accuracy out to 500 yards but will definitely verify by shooting when I get the chance. It's real easy to adjust the marks and print a new one if needed.How did you come up with the yardage marks? Shooting at yardage or a ballistic app.
As they say..I've been making my own for a long time, however I make the marks and numbers by hand. I use white electrical tape, make marks and numbers with ultra fine marker and then place clear tape over to keep from smearing or wiping off...not so pretty but has been working for me.