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Old November 8, 2013, 08:41 PM   #26
Join Date: March 4, 2005
Location: Ohio
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Good thing on that last point, as a lot of pistol brass actually shrinks rather than stretches. If the peak pressure is below around 30,000 psi, the case doesn't stick to the chamber and just backs up like a little piston. If you have a tapered chamber, as many auto pistols do, the case then expands shorter and fatter. Resizing fails to return it completely to length. I once tracked 500 Winchester cases I was loading to target pressures in .45 Auto over 50 reloadings. They lost an average of half a thousandth per load cycle, ending up 0.025" short.
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