Nah, I think thats an old wives tale. My brass has flowed enough for me to need to trim after 5 reloads and this is from a book value, not from a known datum. Even then, Ive only removed 0.010 - 0.015" or fuck all. This means my brass is probably not thinning at the web. I would bet, that most issues are due to brass being overworked and there are people who agree with me Interesting read.
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