I don't know what the velocities are.
I have limited access to a place where I can shoot beyond 900 yards and when I go there, I take the chrony. I make it there about 2x per year. I know it is important to know velocities, but I get lazy. It's too much trouble at the public range.
If I get nice groups at 100, 200, and 300 yards, then I just continue to set out targets at 100 yard increments and see how it does. That is my absolute test for trajectory.