Originally Posted by CAM
Most likely it has to do with the input of info or wrong info entered.
The two programs were within a 1/4 MOA but you were off by 1-1/2 MOA at only 550 yards.
This leads me to think you are doing something wrong, Not the program.
Where did you get the velocity? did you input elevation, did you use standard PB? bullet BC?
maybe it was just bad luck and all little errors added up instead out canceling out.
I use Exbal with confidence for all my rifles.
Exbal or the other ballistic software programs are only as good as the info that you put into them.
You have a high quality scope and rangefinder.
A friend of mine had a similar experience to yours. He was shooting over a cheap chronograph. I verified his procedure, and it checked out. I had him shoot through my PVM-22 infrared chrono and his velocity was way off what he was originally putting in the program.
If you don't have access to one of the better chronographs, find a buddy with a similar one to yours and shoot over it and compare. You may be surprised with what you find.