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Rifles, Reloading, Optics, Equipment
Reloading
Where to measure runout on VLDs?
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<blockquote data-quote="bigedp51" data-source="post: 1421821" data-attributes="member: 28965"><p>The recessed bolt face holds and centers the rear of the case. Meaning the cartridge is not laying in the bottom of the chamber.</p><p></p><p><img src="http://img.photobucket.com/albums/v64/Dragon88/DSCN0407.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The bullet is centered in the chambers throat, and the only part of the full length resized case touching the chamber is the case shoulder. And the cone shaped shoulder also helps center the cartridge in the chamber, when the case is pushed forward by the ejector.</p><p></p><p><img src="https://i.imgur.com/RDNXFbN.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>And below Mr. Salazar a National competitive shooter is describing how the full length resized case is held and fits in the chamber.</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. <strong>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.</strong> 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: #5900b3"></span></p><p><span style="color: #5900b3"><img src="https://i.imgur.com/Y3IiYL5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1421821, member: 28965"] The recessed bolt face holds and centers the rear of the case. Meaning the cartridge is not laying in the bottom of the chamber. [IMG]http://img.photobucket.com/albums/v64/Dragon88/DSCN0407.jpg[/IMG] The bullet is centered in the chambers throat, and the only part of the full length resized case touching the chamber is the case shoulder. And the cone shaped shoulder also helps center the cartridge in the chamber, when the case is pushed forward by the ejector. [IMG]https://i.imgur.com/RDNXFbN.png[/IMG] And below Mr. Salazar a National competitive shooter is describing how the full length resized case is held and fits in the chamber. [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. [B]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.[/B] 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." [img]https://i.imgur.com/Y3IiYL5.jpg[/img][/COLOR] [/QUOTE]
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Where to measure runout on VLDs?
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