I've experienced similar failure to close to battery. Found some of my cases were just "slightly" bulged at the base. I used the Lee Bulge Buster from then on. I've also had occassion where a nick on the case rim would stop the round from fully chambering. Used a little file on those but implementing the Lee B/B took care of it after I started using it. I load for lots of chambers in the same caliber. I now use a case gage on every one. It also gives me a chance for a final quality control check.
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