I got similar ES and SD to muzzle using an F1 Chrony (smaller SD actually 14.8 at 600 yd vs 21.4 at muzzle so could easily be some extra variance in the Chrony).
Terminal velocity at 600 yd was 49 f/s less on Te Puke Silver Mountain system than predicted by Strelok from my F1 Chrony muzzle (3m) velocities. I think the MV measured by the Chrony is likely pretty close as the come up adjustment needed was within 0.1 mRad of Strelok's prediction based on the MV.
This is an example of the testing a hunter can do at a well set up NRA range.