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Rifles, Reloading, Optics, Equipment
Reloading
Headspace and case stretch
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<blockquote data-quote="freddiej" data-source="post: 1634539" data-attributes="member: 26227"><p>Okay some of what I was going to talk about with you has been illustrated in another post. So here goes. I hope I do not offend too many people.</p><p>first, is the brass resized after your first firing? If so, then this is very normal. 223 brass sometimes stretches 0.030" after it's first firing and resize. </p><p>Second it could be excessive head space. This is if you have not resized the cases and they are just fired and cleaned. If this is over 0.010" it can cause case head separation. Even the best brass will start excessively stretching at 0.012"-0.013" excessive head space. This leads to case head separation after one or two firings. </p><p>To check for excessive head space. As illustrated above, resize the case, insert a primer, put it in your rifle and shoot off out the back door, then find your calibers and measure the primer protrusion versus the case in the chamber. that higher number minus the case alone number is the excessive head space. to correct for this problem you now take a feeler gauge of 0.001" to 0.003" thinner and set your sizing die to give you a small amount of excessive head space so the rifle is reliable. okay let me explain that, use the feeler gauge in between your shell plate/case holder and the bottom of your sizing die at the top of the stroke of your press as per normal setting. Your excessive headspace problem is solved. Stretching will be at a minimum from here on out.</p></blockquote><p></p>
[QUOTE="freddiej, post: 1634539, member: 26227"] Okay some of what I was going to talk about with you has been illustrated in another post. So here goes. I hope I do not offend too many people. first, is the brass resized after your first firing? If so, then this is very normal. 223 brass sometimes stretches 0.030" after it's first firing and resize. Second it could be excessive head space. This is if you have not resized the cases and they are just fired and cleaned. If this is over 0.010" it can cause case head separation. Even the best brass will start excessively stretching at 0.012"-0.013" excessive head space. This leads to case head separation after one or two firings. To check for excessive head space. As illustrated above, resize the case, insert a primer, put it in your rifle and shoot off out the back door, then find your calibers and measure the primer protrusion versus the case in the chamber. that higher number minus the case alone number is the excessive head space. to correct for this problem you now take a feeler gauge of 0.001" to 0.003" thinner and set your sizing die to give you a small amount of excessive head space so the rifle is reliable. okay let me explain that, use the feeler gauge in between your shell plate/case holder and the bottom of your sizing die at the top of the stroke of your press as per normal setting. Your excessive headspace problem is solved. Stretching will be at a minimum from here on out. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Headspace and case stretch
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