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The Range
Ammo & Reloading
setting shoulders back
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<blockquote data-quote="swampratt" data-source="post: 2349907" data-attributes="member: 15054"><p>It was winchester brass.. but i have not fired federal or rem brass that many times as the initial accuracy was not there.</p><p>So that brass i have is usually 2x fired or maybe 3.</p><p>I found this reading...EXCELLENT read.</p><p></p><p><a href="http://thefiringline.com/forums/showthread.php?t=347313" target="_blank">http://thefiringline.com/forums/showthread.php?t=347313</a></p><p></p><p>With my now new tool to measure how much my shoulder is set back and reading around and doing a bunch of measuring i have come to the conclusion that my case life was shortened by setting the shoulder back .008" each time.</p><p>Way too much stretching and shrinking going on.</p><p></p><p>The case head web area that is cracking is "Pressure ring" as the guy called it on his measurements is .469"</p><p>My die sizes that area down to .467" so not pinching it down too much.</p><p></p><p>I will be bumping my shoulder back less and do some testing..but for now i have 70 rounds or so set up to hunt with..</p><p>Need to score more winchester brass.</p><p></p><p>MORE measurements for .308</p><p>.308Win cartridge dimension from head to datum is 1.634Max, 1.627"Min.</p><p></p><p>The .308Win chamber to the same 0.400" datum is 1.630" to 1.640".</p><p></p><p>My fired case measures 1.637" to the 0.400" datum.</p><p>Which i assume is fine since the case grows to the chamber spec and slightly relaxes after the initial bump up from firing.</p></blockquote><p></p>
[QUOTE="swampratt, post: 2349907, member: 15054"] It was winchester brass.. but i have not fired federal or rem brass that many times as the initial accuracy was not there. So that brass i have is usually 2x fired or maybe 3. I found this reading...EXCELLENT read. [url]http://thefiringline.com/forums/showthread.php?t=347313[/url] With my now new tool to measure how much my shoulder is set back and reading around and doing a bunch of measuring i have come to the conclusion that my case life was shortened by setting the shoulder back .008" each time. Way too much stretching and shrinking going on. The case head web area that is cracking is "Pressure ring" as the guy called it on his measurements is .469" My die sizes that area down to .467" so not pinching it down too much. I will be bumping my shoulder back less and do some testing..but for now i have 70 rounds or so set up to hunt with.. Need to score more winchester brass. MORE measurements for .308 .308Win cartridge dimension from head to datum is 1.634Max, 1.627"Min. The .308Win chamber to the same 0.400" datum is 1.630" to 1.640". My fired case measures 1.637" to the 0.400" datum. Which i assume is fine since the case grows to the chamber spec and slightly relaxes after the initial bump up from firing. [/QUOTE]
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