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Rifles, Reloading, Optics, Equipment
Reloading
Neck sizing belted magnums
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<blockquote data-quote="bigedp51" data-source="post: 1318885" data-attributes="member: 28965"><p>The vast majority of modern bolt actions have a recessed bolt face and the cartridge does "NOT" lay in the bottom of the chamber</p><p></p><p><img src="http://www.gunsandgunsmiths.com/wp-content/uploads/2013/08/IMG_8545.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://www.shootingtimes.com/files/2011/06/71.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The only rifle I have ever owned that the cartridge did lay in the bottom of the chamber was the British .303 Enfield rifle with its flat nonsupporting bolt face. </p><p></p><p><img src="https://www.milsurps.com/images/imported/2009/12/IMGP6308a-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below is from the "Rifleman's Journal" website written by German A. Salazar in response to a question about partial neck sizing using a full length die.</p><p></p><p></p><p> Reloading: Partial Neck Sizing</p><p>by German A. Salazar</p><p><u><u><u><u><u><u><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></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. <strong>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. </strong>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. <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."</strong></span></p><p><span style="color: #000080"><strong></strong></span></p><p><span style="color: #000080"><strong><span style="color: Black">I belong to the "rat turd in the violin case" club.</span> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></strong></span></p><p><span style="color: #000080"><strong></strong></span></p><p><span style="color: #000080"><strong><img src="http://i.imgur.com/Y3IiYL5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></strong></span></p><p><span style="color: #000080"><strong></strong></span></p><p><span style="color: #000080"><strong></strong><span style="color: black">The trick to fire forming the British .303 cartridge in the large military Enfield rifles chamber and have the excess head clearance removed and <strong>"center"</strong> the case in the rear of the chamber was simple.</span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black">A small rubber o-ring was slipped over the case to hold the case against the bolt face. And when the rubber o-ring was compressed it flowed around the base of the case into the chamber and centered the case in the rear of the chamber.</span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black"><img src="http://i.imgur.com/leGysA2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black">Below the o-ring method of fire forming a rimmed case with a unsupported bolt face for my .303 British Enfield rifles. </span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black"><img src="http://i.imgur.com/FCHGvIZ.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black"><img src="http://i.imgur.com/HHDfGl9.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p><p><span style="color: #000080"><span style="color: black">Bottom line it is a misconception to say any "modern" rifle lets the cartridge "lay" in the bottom of the chamber.</span></span></p><p><span style="color: #000080"><span style="color: black"></span></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1318885, member: 28965"] The vast majority of modern bolt actions have a recessed bolt face and the cartridge does "NOT" lay in the bottom of the chamber [IMG]http://www.gunsandgunsmiths.com/wp-content/uploads/2013/08/IMG_8545.jpg[/IMG] [IMG]http://www.shootingtimes.com/files/2011/06/71.jpg[/IMG] The only rifle I have ever owned that the cartridge did lay in the bottom of the chamber was the British .303 Enfield rifle with its flat nonsupporting bolt face. [IMG]https://www.milsurps.com/images/imported/2009/12/IMGP6308a-1.jpg[/IMG] Below is from the "Rifleman's Journal" website written by German A. Salazar in response to a question about partial neck sizing using a full length die. Reloading: Partial Neck Sizing by German A. Salazar [U][U][U][U][U][U][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][/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. [B]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. [/B]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. [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." [COLOR=Black]I belong to the "rat turd in the violin case" club.[/COLOR] :D [IMG]http://i.imgur.com/Y3IiYL5.jpg[/IMG] [/B][COLOR=black]The trick to fire forming the British .303 cartridge in the large military Enfield rifles chamber and have the excess head clearance removed and [B]"center"[/B] the case in the rear of the chamber was simple. A small rubber o-ring was slipped over the case to hold the case against the bolt face. And when the rubber o-ring was compressed it flowed around the base of the case into the chamber and centered the case in the rear of the chamber. [IMG]http://i.imgur.com/leGysA2.jpg[/IMG] Below the o-ring method of fire forming a rimmed case with a unsupported bolt face for my .303 British Enfield rifles. [IMG]http://i.imgur.com/FCHGvIZ.jpg[/IMG] [IMG]http://i.imgur.com/HHDfGl9.jpg[/IMG] Bottom line it is a misconception to say any "modern" rifle lets the cartridge "lay" in the bottom of the chamber. [/COLOR][/COLOR] [/QUOTE]
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