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After cleaning that barrel, it's clear that there's no permanent damage done (Whew!).
Due to the pressure signs on the primer, a squib doesn't seem likely. I almost wish that it were the problem.
I'm thinking that excessive crimp is what is wrong. I've had the same setting on the die for 9 months without a problem. Perhaps it has been tightening. When I pulled 125 of the plated rounds that were giving me trouble I noticed that half of them were dented below the crimp line while the others weren't. Someone had suggested that the plated round problem (tumbling in the air) was the result of a crimping problem.
I've already got 175 plated rounds left to pull. I'd hate to have to add the 500 jacketed rounds to the list.
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