I had this happen on me while loading a couple of years ago. as far as I could tell, it was the neck being crushed by the seating die while seating the bullet. Strange part is is happened on random brass, I couldn’t find any correlations between them that would cause it to happen, and then just like that it stopped happening. I wound up just pulling the bullets, and resizing the brass back and started over. Odds are your bullets won’t be any good after this though. Mine got shredded on the process.
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