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Old April 18, 2011, 02:18 PM   #12
45 2.1
Junior Member
Join Date: April 11, 2011
Location: Little Egypt, fifedom of Chicago
Posts: 7
Bruce (at BRP) suggested that I also measure the case at the mouth of fire formed brass and I got 0.357" on every case that I checked (at least 25+).

That would be the inside diameter of the fired case neck, not the outside. Remove any vestige of the old crimp before measureing. Take a caliper and place it in the fired case mouth. You should be able to turn it without grabbing, but it will scrape at the point you take the reading.
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