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Rifles, Reloading, Optics, Equipment
Reloading
Stop neck sizing your brass!!!
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<blockquote data-quote="bigedp51" data-source="post: 1405004" data-attributes="member: 28965"><p>No, full length resized brass has elastic qualities and after firing wants to spring back to its resize shape. The only part of a full length resized case that touches the chamber walls is the case shoulder. The ejector and the firing pin will push the case forward until it contacts the chambers shoulder. Full length resizing is "the cartridge should fit the chamber like a rat turd in the violin case". Meaning full length resizing gives the case wiggle room to let the bullet be self aligning with the axis of the bore.</p><p></p><p>Below Mr. Salizar explains the benefits of full length resizing. Again this is because if the case does not have uniform case wall thickness the case warps when fired. And this causes the base of the case to be tilted. And a neck sized case will contact the bolt face and will make the warped case tilt in the chamber. With full length resizing with the proper shoulder bump the base of the case and body of the case is not contacting the bolt face and chamber walls. </p><p></p><p><span style="color: #5900b3">Reloading: Partial Neck Sizing</span></p><p><span style="color: #5900b3">by German A. Salazar</span></p><p><span style="color: #5900b3"><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></span></p><p><span style="color: #5900b3"></span></p><p><span style="color: #5900b3">"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></blockquote><p></p>
[QUOTE="bigedp51, post: 1405004, member: 28965"] No, full length resized brass has elastic qualities and after firing wants to spring back to its resize shape. The only part of a full length resized case that touches the chamber walls is the case shoulder. The ejector and the firing pin will push the case forward until it contacts the chambers shoulder. Full length resizing is "the cartridge should fit the chamber like a rat turd in the violin case". Meaning full length resizing gives the case wiggle room to let the bullet be self aligning with the axis of the bore. Below Mr. Salizar explains the benefits of full length resizing. Again this is because if the case does not have uniform case wall thickness the case warps when fired. And this causes the base of the case to be tilted. And a neck sized case will contact the bolt face and will make the warped case tilt in the chamber. With full length resizing with the proper shoulder bump the base of the case and body of the case is not contacting the bolt face and chamber walls. [COLOR=#5900b3]Reloading: Partial Neck Sizing by German A. Salazar [URL]http://riflemansjournal.blogspot.com/2010/06/reloading-partial-neck-sizing.html[/URL] "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] [/QUOTE]
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Stop neck sizing your brass!!!
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