Greetings @Dicko,
The brass was once fired and Winchester brass. This is some of the thinnest brass and it was not FL sized before loading. its only prep was to chamfer the inside of the mouth. Any case mouths with dings have the expander button run in and out of the mouth. My brass is annealed after every third firing, after every firing for target brass. The test cases were not annealed to remove one more variable. To me the evidence is clear.
Regards Grandpamac.
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