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Rifles, Reloading, Optics, Equipment
Reloading
Case splitting after fired...
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<blockquote data-quote="bigedp51" data-source="post: 1366839" data-attributes="member: 28965"><p>Your shoulder bump is your head clearance when the cartridge is chambered. And if you push the case shoulder back too far when full length sizing you create too much head clearance. The excessive head clearance allows the brass to stretch beyond its elastic limits and causes case head separations.</p><p></p><p><img src="https://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>If you measure a "fired" case with a Hornady cartridge case headspace gauge and then set your die up for .001 to .002 shoulder bump the brass can't stretch and thin.</p><p></p><p>Below measuring a "FIRED" case from my AR15 rifle, and then I set the die up for .003 shoulder bump.</p><p></p><p><img src="https://i.imgur.com/OJqNmQH.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below is a exaggerated drawing of full length resizing, and you want to size the case .001 to .002 below the red dotted line. The more you push the case shoulder back toward the green dotted line the greater chance of case head separations.</p><p></p><p><img src="https://i.imgur.com/wm05ArY.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The quality of the brass, chamber diameter and headspace/head clearance governs how long the case will last.</p><p></p><p><img src="https://i.imgur.com/TDwPD1Q.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://i.imgur.com/XEuny9C.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1366839, member: 28965"] Your shoulder bump is your head clearance when the cartridge is chambered. And if you push the case shoulder back too far when full length sizing you create too much head clearance. The excessive head clearance allows the brass to stretch beyond its elastic limits and causes case head separations. [IMG]https://i.imgur.com/HK76WCp.jpg[/IMG] If you measure a "fired" case with a Hornady cartridge case headspace gauge and then set your die up for .001 to .002 shoulder bump the brass can't stretch and thin. Below measuring a "FIRED" case from my AR15 rifle, and then I set the die up for .003 shoulder bump. [IMG]https://i.imgur.com/OJqNmQH.jpg[/IMG] Below is a exaggerated drawing of full length resizing, and you want to size the case .001 to .002 below the red dotted line. The more you push the case shoulder back toward the green dotted line the greater chance of case head separations. [IMG]https://i.imgur.com/wm05ArY.gif[/IMG] The quality of the brass, chamber diameter and headspace/head clearance governs how long the case will last. [IMG]https://i.imgur.com/TDwPD1Q.jpg[/IMG] [IMG]https://i.imgur.com/XEuny9C.jpg[/IMG] [/QUOTE]
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Reloading
Case splitting after fired...
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