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Old August 28, 2015, 01:33 PM   #2
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Join Date: October 21, 2010
Posts: 919
Not an expert, by any means, but if it sizes the neck okay without deforming the case with the decapper/expander assembly removed, the problem pretty much has to be with the decapper/expander. Are you sure the expander didn’t get pushed up inside the die when you resized the case(s) that deformed? The Hornady die is designed for the decapper/expander stem to easily be moved up or down if the locking nut isn’t tightened sufficiently. If that happened, the expander would seal off the neck sizing portion of the die on the upstroke and the case would have no where to go as you continued to push on the handle. A shot in the dark, but worth asking.
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