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"it appears that my fireformed (and neck sized only) winchester brass has Much more case capacity than standard. "
Well, that's one possiblity. Then there's the possiblity of a larger chamber and/or a looser bore than the book test gun. And different powder lots, primer lots, different bore surface, different barrel length, testing on a cooler day or at a lower altitude, etc, etc. Or a combination of several of those possibilities. ??
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