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Rifles, Reloading, Optics, Equipment
Reloading
how to remove jammed cartridges from chamber?
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<blockquote data-quote="woods" data-source="post: 138721" data-attributes="member: 6042"><p>Chawlston is correct. The springback in the brass is reduced after firing several times and the case will develop a crush fit in the shoulder area if only neck sized. Depending upon the type of case and the strength of the load, this crush fit will become severe and cause the problems described in this thread.</p><p></p><p>If you have a Stoney Point Head &amp; Shoulders Gauge you can measure this and relieve the crush fit by Partial Full Length Resizing when the bolt becomes hard to close on a case. I measured the following on a 30-06 and it is typical of all the calibers and rifles I reload for. These cases were neck sized with the Lee Collet and measured to the shoulder with the SP H &amp; S Gauge:</p><p></p><p>new cases - 4.0400" (the measurement isn't important, only its relationship to the other measurements)</p><p>once fired - 4.0485"</p><p>twice fired - 4.0500"</p><p>3 times fired - 4.0510" (very slight crush fit)</p><p>4 times fired - 4.0515" (crush fit, hard to chamber case)</p><p></p><p>This is when I use the Redding Body Die to push the shoulder back to 4.0510". From then on with these case I will have to neck size with the Lee Collet, body size and push the shoulder back with the Redding Body Die for the life of the case.</p><p></p><p>I really don't know how a shooter can neck size only for over 5 loadings of a substantial hunting load without problems. /ubbthreads/images/graemlins/confused.gif</p></blockquote><p></p>
[QUOTE="woods, post: 138721, member: 6042"] Chawlston is correct. The springback in the brass is reduced after firing several times and the case will develop a crush fit in the shoulder area if only neck sized. Depending upon the type of case and the strength of the load, this crush fit will become severe and cause the problems described in this thread. If you have a Stoney Point Head & Shoulders Gauge you can measure this and relieve the crush fit by Partial Full Length Resizing when the bolt becomes hard to close on a case. I measured the following on a 30-06 and it is typical of all the calibers and rifles I reload for. These cases were neck sized with the Lee Collet and measured to the shoulder with the SP H & S Gauge: new cases - 4.0400" (the measurement isn't important, only its relationship to the other measurements) once fired - 4.0485" twice fired - 4.0500" 3 times fired - 4.0510" (very slight crush fit) 4 times fired - 4.0515" (crush fit, hard to chamber case) This is when I use the Redding Body Die to push the shoulder back to 4.0510". From then on with these case I will have to neck size with the Lee Collet, body size and push the shoulder back with the Redding Body Die for the life of the case. I really don't know how a shooter can neck size only for over 5 loadings of a substantial hunting load without problems. [img]/ubbthreads/images/graemlins/confused.gif[/img] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
how to remove jammed cartridges from chamber?
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