Recently acquired the RCBS MIC to check case length and set shoulder bump. Previously I was using a Hornady Comparator and the 30 cal. insert, figuring that would get me close enough to the datum line.
Here's my head scratcher.
Lake City brass, full length sized in a Lee die, twice fired in the same gun, last firing was all with the same load. Rifle was an AR, Wylde chamber.
MIC readings vary from +.004" to -.003", or .007" total variance.
Is this a normal variance? Seems wide to me. Most were between +.001" and +.003".
Set the Redding bump die to get zero on the MIC and call it good?
