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Rifles, Reloading, Optics, Equipment
Reloading
Case Head Separation
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<blockquote data-quote="Hugnot" data-source="post: 2290620" data-attributes="member: 115658"><p>Great pics - shows what's happening.</p><p></p><p>Upon repetitive sizing brass become more "work hardening" and cases need to be trimmed because it gets longer. The brass flows forward increasing length. How many firing cycles to get to ,the point where brass thickness just forward of web is reduced to the point of separation occurs is sort of speculative but logically it should happen. Upon all that sizing the brass become less ductile and thinner because of work hardening and stretching then - separation.</p><p></p><p>I have not made comparisons of the degree various dies work cases. I use a Redding small base body die for resizing once fired .223/5.56 brass for my .20 P rodent rifle & I only do this 1 time. The body die does not size the neck. The Redding type S F/L .223 sizer with a .226 bushing does not size the base enough and 1 out of 10 used once fired .223/5.56 cases get stuck in the chamber enough so the rim gets ripped off & extraction needs to be done with a cleaning rod. My RCBS .223 F/L die sizes the once fires bases enough to enable normal extraction.</p><p></p><p>I like Forster F/L dies & after I check things out with brass & chamber I send them back to be honed out. Forster apparently has increased their charge to do this - just under $30. Lapua brass is real pricy but cost differences are mitigated when brass life is considered.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2290620, member: 115658"] Great pics - shows what's happening. Upon repetitive sizing brass become more "work hardening" and cases need to be trimmed because it gets longer. The brass flows forward increasing length. How many firing cycles to get to ,the point where brass thickness just forward of web is reduced to the point of separation occurs is sort of speculative but logically it should happen. Upon all that sizing the brass become less ductile and thinner because of work hardening and stretching then - separation. I have not made comparisons of the degree various dies work cases. I use a Redding small base body die for resizing once fired .223/5.56 brass for my .20 P rodent rifle & I only do this 1 time. The body die does not size the neck. The Redding type S F/L .223 sizer with a .226 bushing does not size the base enough and 1 out of 10 used once fired .223/5.56 cases get stuck in the chamber enough so the rim gets ripped off & extraction needs to be done with a cleaning rod. My RCBS .223 F/L die sizes the once fires bases enough to enable normal extraction. I like Forster F/L dies & after I check things out with brass & chamber I send them back to be honed out. Forster apparently has increased their charge to do this - just under $30. Lapua brass is real pricy but cost differences are mitigated when brass life is considered. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Case Head Separation
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