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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: 1421266" data-attributes="member: 28965"><p>Below Mr. Salazar is talking about the benefits of full length resizing vs partial full length resizing or neck sizing. And a full length resized case has more "wiggle room" to let the bullet be self aligning with the axis of the bore. Meaning as the late Jim Hull of Sierra bullets test lab would say, "The cartridge should fit the chamber like a rat turd in a violin case."</p><p></p><p>Meaning the Hornady gauge above holds the cartridge like it would be if chambered in the rifle.</p><p></p><p><span style="color: #0000b3">Reloading: Partial Neck Sizing</span></p><p><span style="color: #0000b3">by German A. Salazar</span></p><p><span style="color: #0000b3"><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: #0000b3"></span></p><p><span style="color: #0000b3">"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: #0000b3"></span></p><p><span style="color: #0000b3"><span style="color: #000000">So you can see from reading above a neck sized case if it warps when first fired can cause the bullet to be out of alignment with the bore. So again a full length resized case is more forgiving with bullet alignment with the bore. But most people spin the case on its body and your runout can be caused by a egg shaped case body. Meaning spinning the case on the case body would be more appropriate with neck sized cases. </span></span></p><p></p><p><span style="color: #0000b3"><span style="color: #000000">So again, where is the runout coming from, a egg shaped case or a off center case neck.</span></span></p><p></p><p><span style="color: #0000b3"><span style="color: #000000">And the military considers match grade ammo to have .003 or less bullet runout. </span></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1421266, member: 28965"] Below Mr. Salazar is talking about the benefits of full length resizing vs partial full length resizing or neck sizing. And a full length resized case has more "wiggle room" to let the bullet be self aligning with the axis of the bore. Meaning as the late Jim Hull of Sierra bullets test lab would say, "The cartridge should fit the chamber like a rat turd in a violin case." Meaning the Hornady gauge above holds the cartridge like it would be if chambered in the rifle. [COLOR=#0000b3]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=#000000]So you can see from reading above a neck sized case if it warps when first fired can cause the bullet to be out of alignment with the bore. So again a full length resized case is more forgiving with bullet alignment with the bore. But most people spin the case on its body and your runout can be caused by a egg shaped case body. Meaning spinning the case on the case body would be more appropriate with neck sized cases. [/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000]So again, where is the runout coming from, a egg shaped case or a off center case neck.[/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000][/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000]And the military considers match grade ammo to have .003 or less bullet runout. [/COLOR][/COLOR] [/QUOTE]
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Where to measure runout on VLDs?
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