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Rifles, Reloading, Optics, Equipment
Reloading
I seriously doubt this is case head separation but what do you guys think?
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<blockquote data-quote="bigedp51" data-source="post: 1409762" data-attributes="member: 28965"><p>I have used a full length die to partially resize a case, and prefer to totally full length resize. The only cases I partially full length resize are .303 British cases because the die size and chamber size of the military rifles are far larger than the die.</p><p></p><p>Below German Salazar explains the benefits of full length resizing vs partial full length resizing. Meaning not having the case body having any alignment effect on the bullet in the throat. </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. <strong>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."</span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #000000">I collected milsurp rifles and at one time had 13 British .303 Enfield rifles and understand the word "headspace" better than most people.</span></p><p><span style="color: #000000"></span></p><p><span style="color: #000000">The Enfield rifle had replaceable bolt heads to adjust the rifles headspace. And military headspace is .064 minimum and .074 maximum. And the rifle below has had the headspace set from .058 to .084 and checking to see how much the cases stretch and thin when fired. And now this rifle has two bolt heads fitted to use depending on the cases rim thickness.</span></p><p><span style="color: #000000"></span></p><p><span style="color: #0000b3"><span style="color: #000000"> <img src="https://i.imgur.com/v1GFvaK.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p><p></p><p><span style="color: #0000b3"><span style="color: #000000">And below are my military and SAAMI headspace gauges for my .303 Enfield rifles.</span></span></p><p></p><p><span style="color: #0000b3"><img src="https://i.imgur.com/Ihc1Ywv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #000000">And below is what happens when any rifle has too much head clearance and fired.</span></p><p><span style="color: #0000b3"></span></p><p> <span style="color: #0000b3"><img src="https://i.imgur.com/sHgqVJR.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #0000b3"><span style="color: #000000">"BUT" if the case is properly fire formed the case will not stretch when fired.</span></span></p><p></p><p><span style="color: #0000b3"><img src="https://i.imgur.com/AQEQ9Vw.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #0000b3">And the amount of permissible head clearance depends on the quality of the case and the hardness of the brass.</span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #0000b3">Both cases below were fired in the same 1943 No.4 Enfield rifle with the same load. And as you can see there is a vast difference in case quality and the hardness of the brass. The Prvi Partizan case has thicker rims, is a larger base diameter and .010 thicker in the base web area.</span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #0000b3"><img src="https://i.imgur.com/eM3H3ls.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #0000b3">And all the OP needs to do is take some case measurements and see how much he is reducing the case diameter after sizing the case.</span></p><p><span style="color: #0000b3"></span></p><p><span style="color: #0000b3">A resized case for a semi-auto should be .003 to .005 smaller in diameter than its fired diameter for reliable extraction. And for a full length resized case in a bolt action the case should be .001 to .002 smaller than its fired diameter for reliable extraction. "The cartridge case should fit the chamber like a rat turd in a violin case".</span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1409762, member: 28965"] I have used a full length die to partially resize a case, and prefer to totally full length resize. The only cases I partially full length resize are .303 British cases because the die size and chamber size of the military rifles are far larger than the die. Below German Salazar explains the benefits of full length resizing vs partial full length resizing. Meaning not having the case body having any alignment effect on the bullet in the throat. [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. [B]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] [COLOR=#000000]I collected milsurp rifles and at one time had 13 British .303 Enfield rifles and understand the word "headspace" better than most people. The Enfield rifle had replaceable bolt heads to adjust the rifles headspace. And military headspace is .064 minimum and .074 maximum. And the rifle below has had the headspace set from .058 to .084 and checking to see how much the cases stretch and thin when fired. And now this rifle has two bolt heads fitted to use depending on the cases rim thickness. [/COLOR] [COLOR=#0000b3][COLOR=#000000] [img]https://i.imgur.com/v1GFvaK.jpg[/img][/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000][/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000]And below are my military and SAAMI headspace gauges for my .303 Enfield rifles.[/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000][/COLOR][/COLOR] [COLOR=#0000b3][img]https://i.imgur.com/Ihc1Ywv.jpg[/img] [/COLOR] [COLOR=#000000]And below is what happens when any rifle has too much head clearance and fired.[/COLOR] [COLOR=#0000b3] [img]https://i.imgur.com/sHgqVJR.gif[/img] [COLOR=#000000]"BUT" if the case is properly fire formed the case will not stretch when fired.[/COLOR][/COLOR] [COLOR=#0000b3][COLOR=#000000][/COLOR][/COLOR] [COLOR=#0000b3][img]https://i.imgur.com/AQEQ9Vw.jpg[/img] And the amount of permissible head clearance depends on the quality of the case and the hardness of the brass. Both cases below were fired in the same 1943 No.4 Enfield rifle with the same load. And as you can see there is a vast difference in case quality and the hardness of the brass. The Prvi Partizan case has thicker rims, is a larger base diameter and .010 thicker in the base web area. [img]https://i.imgur.com/eM3H3ls.jpg[/img] And all the OP needs to do is take some case measurements and see how much he is reducing the case diameter after sizing the case. A resized case for a semi-auto should be .003 to .005 smaller in diameter than its fired diameter for reliable extraction. And for a full length resized case in a bolt action the case should be .001 to .002 smaller than its fired diameter for reliable extraction. "The cartridge case should fit the chamber like a rat turd in a violin case".[/COLOR] [/QUOTE]
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I seriously doubt this is case head separation but what do you guys think?
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