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Rifles, Reloading, Optics, Equipment
Reloading
Headspace adjustment with Shellholder??
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<blockquote data-quote="bigedp51" data-source="post: 1338104" data-attributes="member: 28965"><p>Magnum72576</p><p></p><p>You are going to far too much effort dissembling your bolt and "feeling" for resistance.</p><p>Just buy the Hornady cartridge case headspace gauge and measure several fired cases.</p><p>Then adjust you die for .001 to .002 shoulder bump and you are done.</p><p>The Hornady gauge eliminates "feel" and it gives you actual measurements in thousandths of an inch between the fired case and the properly sized case.</p><p></p><p>NOTE, if a case has unequal case wall thickness when fired the thin side of the case expands more. This in turn causes the case to warp with the base of the case tilted and no longer 90 degrees to the axis of the bore. The ejector pushes the case forward and away from the bolt face and with the proper shoulder bump the base of the case does not contact the bolt face.</p><p>Meaning if the case has a little wiggle room in the chamber any warping of the case is minimized and only the case shoulder is contacting the chamber.</p><p></p><p>Below is from the now shutdown "The Riflemans Journal" and where I first read the the "Case should fit the chamber like a rat turd in a violin case".</p><p> </p><p>R<span style="color: #000066">eloading: Partial Neck Sizing</span></p><p><span style="color: #000066">by German A. Salazar</span></p><p><span style="color: #000066"><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: #000066"></span></p><p><span style="color: #000066">"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: #000066"></span></p><p><span style="color: #000066">Below Kevin Thomas of Team Lapua USA who also believes in the Rat Turd in the Violin case.</span></p><p><span style="color: #000066"></span></p><p><span style="color: #000066"><img src="http://i.imgur.com/Y3IiYL5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="color: #000066"></span></p><p><span style="color: #000066">Bottom line if you feel any resistance when closing the bolt on a loaded round you don't have enough wiggle room and the extra room for the rat turd. </span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1338104, member: 28965"] Magnum72576 You are going to far too much effort dissembling your bolt and "feeling" for resistance. Just buy the Hornady cartridge case headspace gauge and measure several fired cases. Then adjust you die for .001 to .002 shoulder bump and you are done. The Hornady gauge eliminates "feel" and it gives you actual measurements in thousandths of an inch between the fired case and the properly sized case. NOTE, if a case has unequal case wall thickness when fired the thin side of the case expands more. This in turn causes the case to warp with the base of the case tilted and no longer 90 degrees to the axis of the bore. The ejector pushes the case forward and away from the bolt face and with the proper shoulder bump the base of the case does not contact the bolt face. Meaning if the case has a little wiggle room in the chamber any warping of the case is minimized and only the case shoulder is contacting the chamber. Below is from the now shutdown "The Riflemans Journal" and where I first read the the "Case should fit the chamber like a rat turd in a violin case". R[COLOR=#000066]eloading: 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." Below Kevin Thomas of Team Lapua USA who also believes in the Rat Turd in the Violin case. [IMG]http://i.imgur.com/Y3IiYL5.jpg[/IMG] Bottom line if you feel any resistance when closing the bolt on a loaded round you don't have enough wiggle room and the extra room for the rat turd. [/COLOR] [/QUOTE]
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Headspace adjustment with Shellholder??
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