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That would be the rim diameter. As Mr Guffey says, I measure before and then again after.
I guess that wouldn't be case head expansion, but case head expansion went way overboard as well. I don't remember the measurement, but I could dig that case out of the archive if it is important to the cause.
And it is the diameter. Horizontal axis would have no meaning as most cases lengthen after firing. Some don't.
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