Thanks for the info.
The bulges were about two thirds down from the neck opening and not always all the way around the case. Sorry I can't send a picture as I discarded all of them at the farm.
I also had some primers that would not detonate. The fired ones had a pristine firing pin mark on them while the ones that didn't fire had a more rounded look to the impressions. I'm using spp and a Hornady hand primer. Is it possible to seat them to deep with this tool? Seated several hundred 223 cartridges with this tool with no issues.
Going to start over today. I have several cases that have been resized and primed with no bulges. I am leaning towards the neck sizing as the problem.
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