I measure the base to datm on brass before firing and them after firing to establish a baseline before doing anything, well unless I use a gage which I measure also. I quit using an expander ball in resizing dies years ago, all they do is stretch necks and make them crooked no matter how well the ball and inside of the neck are lubed. Before headspacing I also try a piece of fired in the gun brass to see what the dies are capable of.
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