Sorry did not see the 2nd one, the operator variation is pretty high, is it a verneir mic or a indicator mic? .0003 with a mic on the same part makes me think the operator does not have the "feel" needed to use a mic. Try a two click thimble mic. You should not see that much of a range. With a thimble mic i would expect .0002 from operator to operator, more than that one of them has a bad techneic. Watch how they use the mic, same part as close to possible same place on part. Does the part have taper? If so that would induce more variation than just the gage and operator. Also note temp, and lenght of time they hold the mic and part. COE is a big factor for mics and parts.
A gr&r is a way to look at the gage and operators ability to measure a feature. At 20%, 80% of the time you are not getting a true accurate measurement.