Patterning is the way to go, to know how a given constriction will work with the loads you have picked.
I too have been playing with a bore meter, and found a unexpected choke on a 28 gauge.
It has 1mm or .039 of constriction, which should be considered an extreme case of over choke. Another 28 gauge measured for comparison has a lot less ( I don't remember exactly) and both are marked the same (Full)
The thing is, the tighter one patterns way better. Obviously it's a tight pattern but very well distributed and perfectly shaped.
