The only change in size on my oldest 45 brass has been to the diameter of the rim from pounding into the breach face. After dozens of reloading cycles some of my cases won't fit into the shell holder on my press. Sometimes I can twist them back and forth and get them to slide in. These are normally some of my 20 year old cases, soon to be regulated to throw away hunting brass. Otherwise I wait until I get a split case mouth to toss the brass.
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