I have a 1 yr old Chrony Alpha and a 20 yr old abused Shooting Chrony. When I set them up back to back, they are anywhere from 5 fps to 60 fps different with no consistancy in the difference. That was a real eye opener. I "think" the 20 yr old Shooting Chrony is actually more accurate. I'll be getting a CED M2
soon and shoot all three of them back to back to get a better idea of what's going on.
That being said, I think chronys are useful tools, but I don't beleive them 100%. I consider their info to be relative and not absolute.
Some good tips and advise on reloading, etc... and if you're getting consistant sub MOA @ 1K, I would say that was pretty good.
Edit: I have also seen very significant swings (close to 100 fps) from morning to afternoon to evening and cloudy vs sunny FWIW