Quote:
Originally Posted by fordson
I’ve run into similar problems where my completed rounds did not gauge fully using a SAAMI spec gauge. The culprit, for me, was case mouth flare or more properly, lack of removing case mouth flare. Re-sizing the cartridge, apparently removed enough of the case flare to allow the case to gauge. A proper crimp finished the job. Worked for me but YMMV.
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^Yes to This^
It took me awhile to figure out, but I was having the same problem with 45 ACP. I discovered that when you run them through the crimp die, the shorter cases don't get crimped (un-flared) enough and won't fit into the case gauge. By simply lowering the crimp die and adding more crimp to the ones that didn't fit, they will fit. Some cases are especially short, and you might have to lower the die a second or third time to get them to fit.