I think as brass manufactures looked for ways to cut costs and manufacturing processes became more accurate (aka: them make more money) we got thinner brass.....I have some older commercial Winchester that the case mouth wall thickness mics right at .014......A new lot of commercial Winchester that I got in last week mics right at .0115 if you check it with a less expensive caliper it rounds up to .012....so, by the time you form it and flow it a couple times it thins quick, and doesn't stand up to as many reloads as it used to.....the brass is still within specs, just on the thinner side of the spec....it's called: quality give-away ( any item sold to a customer above set specifications costs the company more money, meet the minimum spec / make the most money)
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