Are you measuring drop at distance without changing your dials from your zero?
If not, it could be your clicks are not exactly quarter MOA.
I have fired shots over two chronys (Magnetospeed and Prochrono) and had speeds only 1fps difference which gives me confidence in their speed measurements. I have also had scopes that are 0.28 MOA clicks.
Whatever the reason for the difference it doesn’t really matter in the big picture - the software gives you the correct dialling for your load from your rifle with your scope, which is the whole point!
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