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Old January 4, 2013, 07:41 AM   #13
10 Spot Terminator
Senior Member
Join Date: January 3, 2008
Location: Central Oregon
Posts: 348
If the cases are fired there can be a slight variance in the neck length around the rim and measurements will be accented at times if the fired primers are not still seated under flush from the base of the brass. Removing all of the measuring tool variables stated above is the place to start but measuring fired brass is just the nature of the beast. Case in point would be to take one of the cases you are referring to and trim it .005 then measure again. Perfecly trued brass equals perfectly true readings.
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