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Rifles, Reloading, Optics, Equipment
Reloading
Forster bushing bump neck die?
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<blockquote data-quote="bigedp51" data-source="post: 1299383" data-attributes="member: 28965"><p>Below is a No.4 Enfield bolt face and it lets the case lay in the bottom of the chamber because it does not support the rear of the case</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 a Remington 700 "recessed" bolt face that supports and centers the rear of the case in the chamber. Meaning this type bolt face does not let the case lay in the bottom of the chamber. And as German Salazar stated minimizes "case droop" with the rear of the case having clearance between the case and chamber. And "WHY" a full length resized case body does not touch the chamber walls. The only part of a full length resized case that touches the chamber is the case shoulder.</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>Reloading: Partial Neck Sizing</p><p>by German A. Salazar</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. <strong>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 <u>case body and neck will have minimal influence</u>. <u>Let's not forget that the base of the case is supported by the bolt face</u> 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. Barring a seriously out of square case head,<u><strong> 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.</strong></u> 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></p><p>A case expands more on the thin side of the case and this can be in any direction, meaning not just upward. And this is why I posted the NECO case gauge information below about warped cases.</p><p></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="font-size: 12px"><span style="color: #0000FF">"Normal manufacturing tolerances cause brass cartridge cases to vary in wall thickness around the circumference of their bodies. <u><strong>Under the stress of firing, a case with such variation stretches more readily along its thin side,</strong></u> transferring more pressure to the bolt face at that point and introducing an unbalanced force which contributes to bolt whip and vibration of the barreled action in its bedding"</span></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="font-size: 12px"><span style="color: #0000FF"><span style="font-size: 10px"></span></span></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="font-size: 12px"><span style="color: #0000FF"><span style="font-size: 10px"><span style="color: black">The above isn't just my opinion it was written about by German Salazar and Kevin Thomas to name just the two who I referenced. </span></span></span></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="font-size: 12px"><span style="color: #0000FF"><span style="font-size: 10px"><span style="color: black"></span></span></span></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="font-size: 12px"><span style="color: #0000FF"><span style="font-size: 10px"><span style="color: black">I full length resize my cases and belong to the case should fit the chamber like a "rat turd in a violin case" fraternity. </span></span></span></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="font-size: 12px"><span style="color: #0000FF"><span style="font-size: 10px"><span style="color: black"></span></span> </span></span></span></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1299383, member: 28965"] Below is a No.4 Enfield bolt face and it lets the case lay in the bottom of the chamber because it does not support the rear of the case [IMG]https://www.milsurps.com/images/imported/2009/12/IMGP6308a-1.jpg[/IMG] Below is a Remington 700 "recessed" bolt face that supports and centers the rear of the case in the chamber. Meaning this type bolt face does not let the case lay in the bottom of the chamber. And as German Salazar stated minimizes "case droop" with the rear of the case having clearance between the case and chamber. And "WHY" a full length resized case body does not touch the chamber walls. The only part of a full length resized case that touches the chamber is the case shoulder. [IMG]http://www.gunsandgunsmiths.com/wp-content/uploads/2013/08/IMG_8545.jpg[/IMG] Reloading: Partial Neck Sizing by German A. Salazar [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. [B]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 [U]case body and neck will have minimal influence[/U]. [U]Let's not forget that the base of the case is supported by the bolt face[/U] 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. Barring a seriously out of square case head,[U][B] 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.[/B][/U] 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] A case expands more on the thin side of the case and this can be in any direction, meaning not just upward. And this is why I posted the NECO case gauge information below about warped cases. [FONT=Arial][SIZE=2][SIZE=3][COLOR=#0000FF]"Normal manufacturing tolerances cause brass cartridge cases to vary in wall thickness around the circumference of their bodies. [U][B]Under the stress of firing, a case with such variation stretches more readily along its thin side,[/B][/U] transferring more pressure to the bolt face at that point and introducing an unbalanced force which contributes to bolt whip and vibration of the barreled action in its bedding" [SIZE=2] [COLOR=black]The above isn't just my opinion it was written about by German Salazar and Kevin Thomas to name just the two who I referenced. I full length resize my cases and belong to the case should fit the chamber like a "rat turd in a violin case" fraternity. [/COLOR][/SIZE] [/COLOR][/SIZE][/SIZE][/FONT] [/QUOTE]
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Forster bushing bump neck die?
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