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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension Effect on Accuracy
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<blockquote data-quote="bigedp51" data-source="post: 1253326" data-attributes="member: 28965"><p>Below is from German A. Salazar's "The Riflemans Journal" in reply to a question about partial full length resizing which he did not </p><p>recommend. </p><p></p><p>Below he is talking about the benefits of "full length resizing in relation to the cases fit and alignment in the chamber.</p><p></p><p>Mr. Salazar often quoted the late Jim Hull of the Sierra ballistic test lab who also favored full length resizing. </p><p></p><p>Below is Jim Hull's humorous quote about full length resizing.</p><p></p><p><strong><span style="color: Blue">"The case should fit the chamber like a rat turd in a violin case."</span></strong></p><p></p><p>Below Mr. Salazar is describing the full length resized case and its fit and alignment in the chamber.</p><p></p><p>Reloading: Partial Neck Sizing</p><p>by German A. Salazar</p><p><u><u><u><u><u><u><a href="http://riflemansjournal.blogspot.com/2010/06/reloading-partial-neck-sizing.html" target="_blank">http://riflemansjournal.blogspot.com/2010/06/reloading-partial-neck-sizing.html</a></u></u></u></u></u></u></p><p></p><p><span style="color: #000080">"Now the last scenario, a full-length sized case in which the neck is also fully sized. There is clearance at the neck and in the body of the case, the closest fit anywhere is the bullet in the throat. If the neck to bullet concentricity is good (although it needn't be perfect), then the bullet will find good alignment in the throat and the case body and neck will have minimal influence. Let's not forget that the base of the case is supported by the bolt face or the extractor to a certain degree as well; this is yet another influence on alignment. As you can see, there are several points from base to bullet that can have an effect. My procedure is to minimize the influence of those that I can control, namely the case body and neck, and let the alignment be dictated by the fit of the bullet in the throat and to some extent by the bolt's support of the base. Barring a seriously out of square case head, I don't think the bolt can have a negative effect on alignment, only a slightly positive effect from minimizing "case droop" in the chamber. Given that a resized case will usually have a maximum of 0.001" diametrical clearance at the web, this isn't much of a factor anyway."</span></p><p><span style="color: #000080"></span></p><p><span style="color: #000080"><span style="color: black">If you do a search here and look up</span> </span>"Kevin Thomas" who worked under Jim Hull and later ran the Sierra test lab and who now shoots for Team Lapua USA you will find more full length resizing advice. (The rat turd in a violin case)</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1253326, member: 28965"] Below is from German A. Salazar's "The Riflemans Journal" in reply to a question about partial full length resizing which he did not recommend. Below he is talking about the benefits of "full length resizing in relation to the cases fit and alignment in the chamber. Mr. Salazar often quoted the late Jim Hull of the Sierra ballistic test lab who also favored full length resizing. Below is Jim Hull's humorous quote about full length resizing. [B][COLOR=Blue]"The case should fit the chamber like a rat turd in a violin case."[/COLOR][/B] Below Mr. Salazar is describing the full length resized case and its fit and alignment in the chamber. Reloading: Partial Neck Sizing by German A. Salazar [U][U][U][U][U][U][URL]http://riflemansjournal.blogspot.com/2010/06/reloading-partial-neck-sizing.html[/URL][/U][/U][/U][/U][/U][/U] [COLOR=#000080]"Now the last scenario, a full-length sized case in which the neck is also fully sized. There is clearance at the neck and in the body of the case, the closest fit anywhere is the bullet in the throat. If the neck to bullet concentricity is good (although it needn't be perfect), then the bullet will find good alignment in the throat and the case body and neck will have minimal influence. Let's not forget that the base of the case is supported by the bolt face or the extractor to a certain degree as well; this is yet another influence on alignment. As you can see, there are several points from base to bullet that can have an effect. My procedure is to minimize the influence of those that I can control, namely the case body and neck, and let the alignment be dictated by the fit of the bullet in the throat and to some extent by the bolt's support of the base. Barring a seriously out of square case head, I don't think the bolt can have a negative effect on alignment, only a slightly positive effect from minimizing "case droop" in the chamber. Given that a resized case will usually have a maximum of 0.001" diametrical clearance at the web, this isn't much of a factor anyway." [COLOR=black]If you do a search here and look up[/COLOR] [/COLOR]"Kevin Thomas" who worked under Jim Hull and later ran the Sierra test lab and who now shoots for Team Lapua USA you will find more full length resizing advice. (The rat turd in a violin case) [/QUOTE]
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