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I was loading 1,000 rounds of 5.56. I test fired after about 200, everything ops checked good. Started loading again and after a 100 or so I noticed my sizing die was loose. I reset it and continued. I test fired again and found they wouldn't chamber. Now I have about 200 rounds that gage good but half won't chamber. I'm trying to avoid pulling all of them apart as I know at least half are good. What could cause this?