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On looking at the batch of ammo that was faulty some of the cases have a soot ring appearing around the primer although the primer didnt drop out.

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The cases that have soot marks around the primers also have a color change at the throat of the cartridge which looks a little like annealing marks. This may have been caused by a hot chamber.????

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The chamber would have to be VERY hot to ever be able to anneal the brass cartridge case.
The difference in colour "could" mean that the brass was of a different hardness on those particular cases, compared to others from the same batch.

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