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For pistol cases, I don't worry too much about variations in chamber pressures when using mixed headstamp range brass with unknown reload history as I typically use mid-to-high range load data. When I use near max/max load data loads, I prefer to use verified once-fired brass (ones I saw go from factory new boxes to the pistols).
But for rifle cases, when I am using thicker walled military cases with decreased internal volume (as measured by water volume), I will back off the near max/max charge during powder workup as decreased volume will increase the chamber pressure.
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