December 20, 2012, 11:42 AM
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#11
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Senior Member
Join Date: July 26, 2011
Location: USA
Posts: 1,730
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Compare your brass to SAAMI measurements at link.
http://www.saami.org/PubResources/CC...Winchester.pdf .475" at the base? If you mean the web area, that too big. Normal dies dont size down that far. Plus your die seems on the tight side. Just a quick guess. 
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