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It certainly looks in the range I would expect. I don't know the resolution of your micrometer, has it been properly calibrated, or your skill in using it. Not criticizing, just identifying what I don't know.
If you slug the bore, then take that slug and see if it will pass through each throat with only finger pressure, it will give you the relationship between the barrel groove diameter and your throats. If you use pure lead for slugging (muzzleloader balls are swaged pure lead) it will result in better accuracy.
I use pin gages to measure throats, but since the throats are not always round, I wind up measuring the minor diameter, not the major diameter.
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