If it closes smoothly on the go gage I'd be suspicious of other things first. Remember headspace is cartridge case base to shoulder Datum line. If you don't have the tools to measure the headspace of the brass cases your just guessing. A few of the new cases might be a touch long to the datum or a short chamber to end of the neck or short throat. I wouldn't be to quick to take it apart without checking the other things first. Let us know what you find.
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