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Old May 5, 2011, 07:35 AM   #11
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Join Date: November 22, 2006
Posts: 2,684
It doesn't take a lot of pressure to expand the case to fit the chamber. Then you reduce its size back to original when resizing. Annealing allows you to bend the metal back and forth without it breaking. Some of my cases have seen 10x use before cracking compared to not annealing.
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