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The Range
Ammo & Reloading
RCBS X-Die Small Base Sizer, .308 Win
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<blockquote data-quote="swampratt" data-source="post: 3071608" data-attributes="member: 15054"><p>With regular dies the neck will not get thicker as brass gets pushed forward during firing.</p><p>I have checked that after firing 4 different headstamp cases until they failed some were shot over 50 times.. the neck did NOT get thicker but brass grew at a rate of .001" per firing some grew at .0015" per firing.</p><p>The case head web area got much thinner during this time as i cut one apart and measured thickness after 45 times fired and FLS and it was much thinner than a 1x fired case That was Lapua .308.</p><p></p><p>Case head crack was the fail point. Necks were not annealed during the fail testing.</p><p>I would like to know what the measurement of your cases are after resizing.</p><p></p><p>It may not be the OD of the case at all and it could be you are not pushing the shoulder back and it is binding there.</p><p>My ar15 needs the shoulder pushed back farther than my bolt gun and if I use my bolt gun ammo in the ar it will bind up.</p><p>Push the shoulder back .002" more and no issues.</p><p></p><p>Measure a case after sizing .I have a lee .308 die that makes the case .4070" max diameter at the case head area.</p><p>At the junction just below the shoulder it measures .4050" this is Lapua case and R-P brass is .001" smaller.</p><p></p><p>Check a fired case for the ogive at the shoulder length and then measure a sized case.</p><p>You can actually set up a sizing die to pull the shoulder forward from the fired position if it is the type with a mandrel you pull through the inside of the case.</p><p>This will create some real issues for chambering and extracting.</p><p></p><p>Neck sized brass fail test shower .0005" of case growth in length for the first 5 firings then after neck sizing #6 growth was .0005" for 2 shots. I quit measuring at 20 times neck sized.</p><p>Just numbers for you to chew on.</p><p>Not that neck sizing will work in your gun at all.</p><p></p><p>I would almost bet it is a shoulder position issue.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3071608, member: 15054"] With regular dies the neck will not get thicker as brass gets pushed forward during firing. I have checked that after firing 4 different headstamp cases until they failed some were shot over 50 times.. the neck did NOT get thicker but brass grew at a rate of .001" per firing some grew at .0015" per firing. The case head web area got much thinner during this time as i cut one apart and measured thickness after 45 times fired and FLS and it was much thinner than a 1x fired case That was Lapua .308. Case head crack was the fail point. Necks were not annealed during the fail testing. I would like to know what the measurement of your cases are after resizing. It may not be the OD of the case at all and it could be you are not pushing the shoulder back and it is binding there. My ar15 needs the shoulder pushed back farther than my bolt gun and if I use my bolt gun ammo in the ar it will bind up. Push the shoulder back .002" more and no issues. Measure a case after sizing .I have a lee .308 die that makes the case .4070" max diameter at the case head area. At the junction just below the shoulder it measures .4050" this is Lapua case and R-P brass is .001" smaller. Check a fired case for the ogive at the shoulder length and then measure a sized case. You can actually set up a sizing die to pull the shoulder forward from the fired position if it is the type with a mandrel you pull through the inside of the case. This will create some real issues for chambering and extracting. Neck sized brass fail test shower .0005" of case growth in length for the first 5 firings then after neck sizing #6 growth was .0005" for 2 shots. I quit measuring at 20 times neck sized. Just numbers for you to chew on. Not that neck sizing will work in your gun at all. I would almost bet it is a shoulder position issue. [/QUOTE]
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RCBS X-Die Small Base Sizer, .308 Win
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