crimedog - NO - .001" is TWICE that of .0005".

.0005
+ .0005
.0010

If you are getting .001" of expansion, there is TOO much and you are probably over expanded, and over pressures. Other idea might be you can't read the micrometer well enough. I would get a digital one that reads to .XXXX" and make sure before duplicating that load again.

You would not want more than .0005" of expansion from a new, sized case at the head, to a fired case at the same point. After that.0005" is where you will be into excessive pressure.