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Rifles, Reloading, Optics, Equipment
Reloading
Case Head Seperation and Brass Growth at Resizing
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<blockquote data-quote="AZShooter" data-source="post: 771128" data-attributes="member: 5219"><p>Chambers can vary in length and still be within the SAMMI specifications. </p><p></p><p>I believe you are oversizing your brass. The full length sizing die doesn't have to be fully bottomed out against the shell holder to properly resize once fired brass. You only need to size the brass enough to fit the chamber and reduce the neck diameter to hold a bullet. If brass is over sized and fired, over time this will cause excessive brass flow lengthening the brass which requires frequent trimming. More importantly the brass is thinning down just in front of the web which will cause case separation as you experienced. </p><p></p><p>It is best to use new brass in your rifle and keep it segregated by number of firings. If you follow the steps below your brass should last much longer and you will avoid the case separation issue. </p><p></p><p>Adjust your FL die so there is a space of approx 1/8" between the shell holder and the end of the die. Size a case, wipe it off and try it in the rifle's chamber. It will most likely be snug. Turn die downwards 1/4 turn or so and try again. At some point during this process the brass may get harder to chamber. Continue adjusting the die downwards till the brass fit easily. Fine tune the adjustment by raising it slightly and try again till you get the bolt closure feel that suits your needs. (some folks like a slight resistance) The goal for most hunters is to not have any resistance when cycling a bolt for a speedy second shot. </p><p></p><p>Once you find the setting you can tighten the lock ring setscrew for repeat setup in the future. I prefer to use feeler gauges to measure the gap and put those gauges in the die box. </p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 771128, member: 5219"] Chambers can vary in length and still be within the SAMMI specifications. I believe you are oversizing your brass. The full length sizing die doesn't have to be fully bottomed out against the shell holder to properly resize once fired brass. You only need to size the brass enough to fit the chamber and reduce the neck diameter to hold a bullet. If brass is over sized and fired, over time this will cause excessive brass flow lengthening the brass which requires frequent trimming. More importantly the brass is thinning down just in front of the web which will cause case separation as you experienced. It is best to use new brass in your rifle and keep it segregated by number of firings. If you follow the steps below your brass should last much longer and you will avoid the case separation issue. Adjust your FL die so there is a space of approx 1/8" between the shell holder and the end of the die. Size a case, wipe it off and try it in the rifle's chamber. It will most likely be snug. Turn die downwards 1/4 turn or so and try again. At some point during this process the brass may get harder to chamber. Continue adjusting the die downwards till the brass fit easily. Fine tune the adjustment by raising it slightly and try again till you get the bolt closure feel that suits your needs. (some folks like a slight resistance) The goal for most hunters is to not have any resistance when cycling a bolt for a speedy second shot. Once you find the setting you can tighten the lock ring setscrew for repeat setup in the future. I prefer to use feeler gauges to measure the gap and put those gauges in the die box. Hope this helps. [/QUOTE]
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Case Head Seperation and Brass Growth at Resizing
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