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Rifles, Reloading, Optics, Equipment
Reloading
Video On Bump sizing cases.
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<blockquote data-quote="bigedp51" data-source="post: 1842383" data-attributes="member: 28965"><p>Yes you want a little play and wiggle room on any hunting round, and as the late Jim Hull of the Sierra bullets test lab and competitive shooter said. "The cartridge should fit the chamber like a rat turd in a violin case."</p><p></p><p>Below German Salizar and from his "The Rifleman's Journal" website that was shut down after Mr. Salazar stopped competitive shooting due health reasons. Please note that Mr. Salizar bumped his shoulders back to allow .001 to .002 head clearance. Meaning his cases were not pushed up against the bolt face and had some wiggle room.</p><p></p><p>"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.</p><p></p><p>In conclusion, I believe that allowing the bullet to find a relatively stress-free alignment in the throat by full length sizing (including the neck) and turning necks to enhance concentricity gives the bullet the best probability of a well-aligned start into the rifling."</p><p></p><p>The Rifleman's Journal</p><p>Germán A. Salazar</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1842383, member: 28965"] Yes you want a little play and wiggle room on any hunting round, and as the late Jim Hull of the Sierra bullets test lab and competitive shooter said. "The cartridge should fit the chamber like a rat turd in a violin case." Below German Salizar and from his "The Rifleman's Journal" website that was shut down after Mr. Salazar stopped competitive shooting due health reasons. Please note that Mr. Salizar bumped his shoulders back to allow .001 to .002 head clearance. Meaning his cases were not pushed up against the bolt face and had some wiggle room. "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. In conclusion, I believe that allowing the bullet to find a relatively stress-free alignment in the throat by full length sizing (including the neck) and turning necks to enhance concentricity gives the bullet the best probability of a well-aligned start into the rifling." The Rifleman's Journal Germán A. Salazar [/QUOTE]
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