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Old January 27, 2013, 03:56 PM   #8
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Join Date: December 1, 2002
Posts: 2,832
A hollow base will expand to fill the bore at a lower pressure than a flat base. Unless you're loading at or below midrange pressures there won't be any difference at all in effect. There is precisely no difference in how they are loaded, just seat so the crimp groove is in the proper place and go.
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