As far as I know Chronies are a bit like decibel meters, difficult to compare their numbers to other chronies , but they do make perfect sense on their own ,as long as you use the numbers from only one to come to a conclusion.
I own an FX pocket chrony and after i serviced my regulators my speed differences over +-80 shots are +- 1-2 fps, if the hp reg climbs a few psi i might see a 3 fps difference.
That is all done at the range, I will put some pics up of the range which I am very fortunate to have all to myself at the moment!
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