For lack of better description--it's sometimes a "push comes to shove" thing as to where the displaced brass goes when compressed. Since NH shooter mentioned he was having problems with the shoulder--my guess is that he's encountering too much friction between the expander and the inside of neck while attempting it in one operation.
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"Everyone speaks gun."--Robert O'Neill
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!
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