It's a good idea to verify the chrony by using some 22LR Match ammo. It tends to be very close to published velocities.
Its nice to have that as a verifier.
So far my 9mm loads have consistently been below factory Golden Saber.
Not sure what magic they use but no overpressure and velocity very close to what Remington says it is.
It does seem like most loads are lower than the books say they should be in the 223, 270 and 30-06 loads