Jeff, at what point in trying to make everything match up on the calculator do you start using more than one bc? Is there a distance you add a second and then at further distance you add another or is it just an option when you can't get things lined up perfectly?
I tested a box of factory ammo the other day at 800yds. First I zeroed at 100 and then did an actual drop test at 800. I had an aiming point 16 feet above the target and aimed for it with the scope still dialed for 100. I then dialed in the correct elevation and shot for the center of the target. It was a min low for some reason so I dialed up and fired 3 more groups. They all were about 10" with 2 flyers. Without the flyers they were more like 4". The winds were not playing nice going from 8 all the way around to 3 at 3mph-8mph. I used a kestrel
and entered all the environmental parameters into my Bulletflight app. I entered the heading in and had spin drift and corriollis accounted for. The groups were both left and right but vertically within 4" of center.
My question is in what I did to make the calculator match up perfectly. I used a chrony and have shot these over the chrony before so I have a fair idea on a true velocity. I used the calculate bc feature on the app and was surprised to find the bc reading .347 instead of the advertised .441??? It does match up perfectly however to the actual shooting. I played with velocity a little but it never got exact. Should I worry about not trusting the calculated bc or just run with it? Would using multiple bc's help in this case?
Sorry to the OP for highjacking but thought it might benefit others who read this.