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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation?
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<blockquote data-quote="bigedp51" data-source="post: 1272100" data-attributes="member: 28965"><p>A fired case can stretch in two directions.</p><p></p><p>1. If the case has excessive head clearance meaning excessive shoulder bump. This also applies to the first firing and its possible for a belted case at maximum headspace and with a thin belt to have .015 head clearance.</p><p></p><p>2. The case can stretch outward to meet the chamber walls and add more to the case stretching.</p><p></p><p>I collected British Enfield rifles and at maximum military headspace of .074 and a rim thickness of .058 you would have .016 head clearance.</p><p></p><p>Below is what happens on the first firing with excessive head clearance in a .303 Enfield rifle.</p><p></p><p><img src="http://www.milsurps.com/images/imported/2009/08/headspacestretch_frame_000-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://www.milsurps.com/images/imported/2009/08/headspacestretch1-1.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below is a factory loaded Winchester .303 sectioned case that stretched .009 on its first firing. The headspace was under SAAMI limits at just below .067 but it still had .009 head clearance.</p><p></p><p><img src="http://www.milsurps.com/images/imported/2009/04/IMGP4523-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://www.milsurps.com/images/imported/2009/04/IMGP4521-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://www.milsurps.com/images/imported/2009/10/IMGP4513-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Moral of story, don't let the case stretch on its first firing and keep shoulder bump at the minimum.</p><p></p><p>Second moral of story, don't shoot thin SAAMI Winchester brass with thin rims in a military British Enfield .303 rifle with a long fat military chamber..</p><p></p><p>Third moral of story, rimmed cases and belted case are a design dating back when manufacturing tolerances were very crude. The British came out with the first belted case and they used cordite powder that looked like spaghetti and cut to case shoulder length. The cordite powder was placed in the case "before" the shoulder and neck were formed. And on rimmed and belted cases the location of the shoulder was not critical.</p><p></p><p>Below on the left is a brand new unfired Winchester case, in the middle is a reloaded case fired the second time. And on the right the same case reloaded and fired a third time and just ready to seperate.</p><p></p><p><img src="http://www.milsurps.com/images/imported/2009/06/shouldera-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Bottom line I'm guessing your belted cases stretched the most on their first firing and just kept stretching. My RCBS case mastering gauge pictured above is a great tool for measuring case wall thickness. Its a fancy $100.00 bent paper clip thats measures in thousandths. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>I'm also guessing you cases might be thin just above the belt and possibly at minimum allowable case diameter. Meaning that brand of case is not user friendly in your chamber. If you have any new unfired cases check the case diameter just above the belt where the case seperated. And again after being fired to see how much the case expanded and again after full length resizing. You might also have a fat chamber and a skinny die and over working the brass.</p><p></p><p><strong><span style="color: Red">Major Edit </span></strong></p><p></p><p>Now after all this slow typing with two dyslexic typing fingers and posting all my fantastic photos I find out your shooting a non belted 460S&W pistol cartridge. So now I will give my final guess.</p><p></p><p>Your from Texas and you used too much Kingsford lighter fluid and overloaded your oversized handgun.</p><p></p><p><img src="http://i.imgur.com/tJfBvwM.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Really this isn't really my fault, I need new bifocals and find a braille reloading forum to hang out in.</p><p> </p><p><img src="http://news.yahoo.com/blogs/sideshow/bbq-grill-modeled-smoking-500-magnum-revolver-171050053.html" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://news.yahoo.com/blogs/sideshow/bbq-grill-modeled-smoking-500-magnum-revolver-171050053.html" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1272100, member: 28965"] A fired case can stretch in two directions. 1. If the case has excessive head clearance meaning excessive shoulder bump. This also applies to the first firing and its possible for a belted case at maximum headspace and with a thin belt to have .015 head clearance. 2. The case can stretch outward to meet the chamber walls and add more to the case stretching. I collected British Enfield rifles and at maximum military headspace of .074 and a rim thickness of .058 you would have .016 head clearance. Below is what happens on the first firing with excessive head clearance in a .303 Enfield rifle. [IMG]http://www.milsurps.com/images/imported/2009/08/headspacestretch_frame_000-1.jpg[/IMG] [IMG]http://www.milsurps.com/images/imported/2009/08/headspacestretch1-1.gif[/IMG] Below is a factory loaded Winchester .303 sectioned case that stretched .009 on its first firing. The headspace was under SAAMI limits at just below .067 but it still had .009 head clearance. [IMG]http://www.milsurps.com/images/imported/2009/04/IMGP4523-1.jpg[/IMG] [IMG]http://www.milsurps.com/images/imported/2009/04/IMGP4521-1.jpg[/IMG] [IMG]http://www.milsurps.com/images/imported/2009/10/IMGP4513-1.jpg[/IMG] Moral of story, don't let the case stretch on its first firing and keep shoulder bump at the minimum. Second moral of story, don't shoot thin SAAMI Winchester brass with thin rims in a military British Enfield .303 rifle with a long fat military chamber.. Third moral of story, rimmed cases and belted case are a design dating back when manufacturing tolerances were very crude. The British came out with the first belted case and they used cordite powder that looked like spaghetti and cut to case shoulder length. The cordite powder was placed in the case "before" the shoulder and neck were formed. And on rimmed and belted cases the location of the shoulder was not critical. Below on the left is a brand new unfired Winchester case, in the middle is a reloaded case fired the second time. And on the right the same case reloaded and fired a third time and just ready to seperate. [IMG]http://www.milsurps.com/images/imported/2009/06/shouldera-1.jpg[/IMG] Bottom line I'm guessing your belted cases stretched the most on their first firing and just kept stretching. My RCBS case mastering gauge pictured above is a great tool for measuring case wall thickness. Its a fancy $100.00 bent paper clip thats measures in thousandths. :D I'm also guessing you cases might be thin just above the belt and possibly at minimum allowable case diameter. Meaning that brand of case is not user friendly in your chamber. If you have any new unfired cases check the case diameter just above the belt where the case seperated. And again after being fired to see how much the case expanded and again after full length resizing. You might also have a fat chamber and a skinny die and over working the brass. [B][COLOR=Red]Major Edit [/COLOR][/B] Now after all this slow typing with two dyslexic typing fingers and posting all my fantastic photos I find out your shooting a non belted 460S&W pistol cartridge. So now I will give my final guess. Your from Texas and you used too much Kingsford lighter fluid and overloaded your oversized handgun. [IMG]http://i.imgur.com/tJfBvwM.jpg[/IMG] Really this isn't really my fault, I need new bifocals and find a braille reloading forum to hang out in. [IMG]http://news.yahoo.com/blogs/sideshow/bbq-grill-modeled-smoking-500-magnum-revolver-171050053.html[/IMG] [IMG]http://news.yahoo.com/blogs/sideshow/bbq-grill-modeled-smoking-500-magnum-revolver-171050053.html[/IMG] [/QUOTE]
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