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Old November 19, 2012, 08:19 PM   #12
1stmar
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Join Date: March 21, 2012
Location: Connecticut
Posts: 1,260
I see potentially conflicting data as it relates to production rifles and dies. I have no doubt you guys are correct wrt bench rest shooters with custom rifles and dies. However in factory rifles and factory dies, the case will expand to roughly the size of he chamber. By resizing the case it will be below the recommendations old roper mentions where case tolerances are minimized and only sized enough to extract. This makes sense and likely helps keep consistent pressure. So given that factory chambers are likely on the sloppy side, perhaps not resizing the case body achieves or approximates this goal? Since there is really no way to know for wether case to chamber fit or neck/shoulder centering is more advantageous, given factory rifles it seem plausible that not resizing the case body may be better and doing the best you can to ensure concentricity will help minimize the effects of off center necks.
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