I just measured 3 NEW never fired cases for ya. Then I measured 3 cases I have fired 7 times. ALL of the cases were .0135" to .014" and I measured in about 6 places around the neck.
I was suprised the 7 X cases were same as new. Well... not really this brass is amazing. My spent primers still make a "pop" sound comming out. And every case out of 100 fired 7 times, the primers all felt exactly the same going in..