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Rifles, Reloading, Optics, Equipment
Reloading
Help determining actual incipient head case seperation signs
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<blockquote data-quote="bigedp51" data-source="post: 1467717" data-attributes="member: 28965"><p>Thank you RT2506 I learned the hard way in what you said above in the 1970s and collecting and shooting milsurp rifles. At maximum military headspace on the .303 British Enfield of .074 and a rim thickness of .058 you will have .016 head clearance.</p><p></p><p>And on these rimmed cases you could slip a thin rubber o-ring around the case to hold it against the bolt face to fire form the cases. This prevents the case from stretching on the first firing and thereafter you neck size only, and let the case headspace on its shoulder.</p><p></p><p><img src="https://i.imgur.com/leGysA2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://i.imgur.com/AQEQ9Vw.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>The secret to long case life is being able to measure the fired cases shoulder location and using minimum shoulder bump.</p><p></p><p>The picture below is worth a thousand words, when full length resizing you only want to push the shoulder back .001 to ,002 below the red dotted line. The closer to the green dotted line you push the shoulder the more the case will stretch and thin and cause a case head separation.</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>NOTE, if you make a workup load starting at the suggested start load and work up, you will find the point the primers are flush with the base of the case. It is at this point the pressure is great enough to make the case stretch to meet the bolt face. Below this pressure point you can load new cases with the bullet jammed into the rifling or make a false shoulder to form them to the chamber without any case stretching.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1467717, member: 28965"] Thank you RT2506 I learned the hard way in what you said above in the 1970s and collecting and shooting milsurp rifles. At maximum military headspace on the .303 British Enfield of .074 and a rim thickness of .058 you will have .016 head clearance. And on these rimmed cases you could slip a thin rubber o-ring around the case to hold it against the bolt face to fire form the cases. This prevents the case from stretching on the first firing and thereafter you neck size only, and let the case headspace on its shoulder. [IMG]https://i.imgur.com/leGysA2.jpg[/IMG] [img]https://i.imgur.com/AQEQ9Vw.jpg[/img] The secret to long case life is being able to measure the fired cases shoulder location and using minimum shoulder bump. The picture below is worth a thousand words, when full length resizing you only want to push the shoulder back .001 to ,002 below the red dotted line. The closer to the green dotted line you push the shoulder the more the case will stretch and thin and cause a case head separation. [IMG]https://i.imgur.com/wm05ArY.gif[/IMG] NOTE, if you make a workup load starting at the suggested start load and work up, you will find the point the primers are flush with the base of the case. It is at this point the pressure is great enough to make the case stretch to meet the bolt face. Below this pressure point you can load new cases with the bullet jammed into the rifling or make a false shoulder to form them to the chamber without any case stretching. [/QUOTE]
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Help determining actual incipient head case seperation signs
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