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Old November 9, 2018, 12:46 PM   #16
Senior Member
Join Date: December 10, 2014
Location: Texas
Posts: 1,522
If you wanna take the time and do some measuring, you will most likely see some eye opening things.

Measure the rim diameter against an unfired case, then measure the case body just above the rim with both cases again.

I have observed rim expansion as much as 0.006" which gives some indication as to how much the pressure hammered the case.

The ideal would be to measure the case before firing and after firing.

I have all my brass recorded in this manner.
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