Federal primer pockets seem to get loose sooner than others but not too bad. As soon as I notice one being a little loose I mark it with a Sharpie then crush it when I fire it. That keeps me or some other brass hound from using it again. I have some Winchester brass that has been loaded 8 times that still works fine. I haven't run across any A-Merc yet.All the others work too I just keep a close watch on them. I don't do steel or aluminum at all.
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