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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation?
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<blockquote data-quote="bigedp51" data-source="post: 1273542" data-attributes="member: 28965"><p>Engineer40</p><p></p><p>If your die is reducing the case diameter too much it will over work the brass and cause it to fail. Measure a new case a fired case and a resized case and see how much the brass is being worked.</p><p></p><p>Next take a resized case and measure the cases overall length and write it down.</p><p></p><p>Next take a fired spent primer and just using your fingers start the primer into the primer pocket.</p><p></p><p>Now chamber this case and let the bolt face seat the primer and remove the case.</p><p></p><p>Now measure the case again from the base of the primer to the case mouth and write it down.</p><p></p><p>Now subtract the first case measurement from the second and this will be your head clearance or the air space between the rear of the case and the bolt face. This will be the distance the case can stretch when fired. With thin rims and at maximum headspace your case could stretch .010. </p><p></p><p>This is where you want to know your head clearance and how much lengthwise stretch the case has. Add this to your base diameter increase and you will have the total case stretch.</p><p></p><p>Using the primer trick is the cheap bastards headspace gauge. And if you measure your rim thickness and add it to your head clearance measurement you will have your rifles actual headspace reading.</p><p></p><p><img src="http://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Measure OAL of case</p><p></p><p><img src="http://i.imgur.com/SgwqgaU.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Fully seat spent fired primer with bolt face and remeasure to get head clearance. </p><p></p><p><img src="http://i.imgur.com/oNIvIiX.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i.imgur.com/zQxlYGp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1273542, member: 28965"] Engineer40 If your die is reducing the case diameter too much it will over work the brass and cause it to fail. Measure a new case a fired case and a resized case and see how much the brass is being worked. Next take a resized case and measure the cases overall length and write it down. Next take a fired spent primer and just using your fingers start the primer into the primer pocket. Now chamber this case and let the bolt face seat the primer and remove the case. Now measure the case again from the base of the primer to the case mouth and write it down. Now subtract the first case measurement from the second and this will be your head clearance or the air space between the rear of the case and the bolt face. This will be the distance the case can stretch when fired. With thin rims and at maximum headspace your case could stretch .010. This is where you want to know your head clearance and how much lengthwise stretch the case has. Add this to your base diameter increase and you will have the total case stretch. Using the primer trick is the cheap bastards headspace gauge. And if you measure your rim thickness and add it to your head clearance measurement you will have your rifles actual headspace reading. [IMG]http://i.imgur.com/HK76WCp.jpg[/IMG] Measure OAL of case [IMG]http://i.imgur.com/SgwqgaU.jpg[/IMG] Fully seat spent fired primer with bolt face and remeasure to get head clearance. [IMG]http://i.imgur.com/oNIvIiX.jpg[/IMG] [IMG]http://i.imgur.com/zQxlYGp.jpg[/IMG] [/QUOTE]
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Case head separation?
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