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Rifles, Reloading, Optics, Equipment
Reloading
Case Seperation 300 Ultra
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<blockquote data-quote="J E Custom" data-source="post: 1279501" data-attributes="member: 2736"><p>Case head separation Is caused by several things. It is normally associated with head space issues.</p><p></p><p>Excessive headspace, can be caused by the smith building in excessive head space when chambering. Head space should be held to a very minimum because of the undersized new brass</p><p>to minimize stretching it when initially Firing it. Case head separation normally starts on the first firing when head space is excessive weakening the brass in the beginning. Then every time it is "Over sized" the problem get worse until it fails.</p><p></p><p>I have found that Bumping the shoulder only improves the chance of this happening so I don't do it. If the brass starts to get tight, I size just enough to chamber. I also neck size only as long as the cartridge chambers to minimize working the brass any more than necessary. The use of bushing dies has also improved the brass life by cutting the number of sizing's by 50% if used correctly.</p><p></p><p>Every time you size the brass it expands to fit the chamber when fired, so the less you can work the brass the longer it will last with frequent annealing (Every 3rd or 4th loading). </p><p></p><p>Ejector Marks on the case head can be from over sizing (Increasing head spacing allowing the case head to slam into the bolt face) or from high pressure loads (Most common cause) a dirty/oily chamber can also cause this by increasing bolt loading.</p><p></p><p>Others may have different recommendations to prevent case head separations, but this works for me and it has been rare for me to get a case head separation.</p><p></p><p>Hope this helps</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1279501, member: 2736"] Case head separation Is caused by several things. It is normally associated with head space issues. Excessive headspace, can be caused by the smith building in excessive head space when chambering. Head space should be held to a very minimum because of the undersized new brass to minimize stretching it when initially Firing it. Case head separation normally starts on the first firing when head space is excessive weakening the brass in the beginning. Then every time it is "Over sized" the problem get worse until it fails. I have found that Bumping the shoulder only improves the chance of this happening so I don't do it. If the brass starts to get tight, I size just enough to chamber. I also neck size only as long as the cartridge chambers to minimize working the brass any more than necessary. The use of bushing dies has also improved the brass life by cutting the number of sizing's by 50% if used correctly. Every time you size the brass it expands to fit the chamber when fired, so the less you can work the brass the longer it will last with frequent annealing (Every 3rd or 4th loading). Ejector Marks on the case head can be from over sizing (Increasing head spacing allowing the case head to slam into the bolt face) or from high pressure loads (Most common cause) a dirty/oily chamber can also cause this by increasing bolt loading. Others may have different recommendations to prevent case head separations, but this works for me and it has been rare for me to get a case head separation. Hope this helps J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Case Seperation 300 Ultra
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