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Rifles, Reloading, Optics, Equipment
Reloading
0.03" growth after first fire (264WM WW Brass)
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<blockquote data-quote="entoptics" data-source="post: 2045344" data-attributes="member: 104268"><p>[USER=13632]@bigngreen[/USER] and [USER=111667]@Mram10us[/USER] Just to assist and clarify with the math that's being done above...</p><p></p><p>I'm measuring the virgin brass at 2.102 to shoulder. That's 0.014" below datum (2.1162), and 0.007" below minimum tolerance. AND THAT'S WITH A 0.41 BUSHING IN MY COMPARATOR! On a 25° shoulder, that extra 0.01 means my measurement should be ~0.01" <em>longer</em> than the SAAMI diagram would say.</p><p></p><p>So these bad boys are short. Like 0.017" short of shortest allowed... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite10" alt=":oops:" title="Oops! :oops:" loading="lazy" data-shortname=":oops:" /></p><p></p><p>Also, this is a Savage pre-fit. I set headspace at Go-Gauge plus a smidgen. Painter's tape (≤ 0.004") on Go-Gauge was a HARD (as in not a chance), No-Go. Measuring fired brass, I'm getting 2.132". Subtract the 0.01 for the 41 bushing, and that's 2.122", which is actually a smidge BELOW minimum SAAMI spec.</p><p></p><p>Add that all up, and my WAY below SAAMI spec brass are growing 0.03" on first firing in a below SAAMI minimum chamber. In a max SAAMI chamber, that would be 0.04" growth.</p><p></p><p>[USER=111667]@Mram10us[/USER] I'm not alone in your surprise. Hence the thread.</p><p></p><p>That said, I have the tools to monitor incipient separation, and at least the first round of test-load brass, appears to be just fine.</p><p></p><p>I think I'm going to do an experiment next on 12 each of virgin, neck turned virgin, and once fired.</p><p></p><p>1) Pin tumble</p><p>2) Measure case volume and dimensions</p><p>3) Run two powders and two bullets, 3 shots per recipe.</p><p></p><p>It's 3X the supplies, and I hate to waste bullets (primers?) during these times, but I'd rather figure out the consequences of my actions and new equipment, sooner rather than later.</p></blockquote><p></p>
[QUOTE="entoptics, post: 2045344, member: 104268"] [USER=13632]@bigngreen[/USER] and [USER=111667]@Mram10us[/USER] Just to assist and clarify with the math that's being done above... I'm measuring the virgin brass at 2.102 to shoulder. That's 0.014" below datum (2.1162), and 0.007" below minimum tolerance. AND THAT'S WITH A 0.41 BUSHING IN MY COMPARATOR! On a 25° shoulder, that extra 0.01 means my measurement should be ~0.01" [I]longer[/I] than the SAAMI diagram would say. So these bad boys are short. Like 0.017" short of shortest allowed... :oops: Also, this is a Savage pre-fit. I set headspace at Go-Gauge plus a smidgen. Painter's tape (≤ 0.004") on Go-Gauge was a HARD (as in not a chance), No-Go. Measuring fired brass, I'm getting 2.132". Subtract the 0.01 for the 41 bushing, and that's 2.122", which is actually a smidge BELOW minimum SAAMI spec. Add that all up, and my WAY below SAAMI spec brass are growing 0.03" on first firing in a below SAAMI minimum chamber. In a max SAAMI chamber, that would be 0.04" growth. [USER=111667]@Mram10us[/USER] I'm not alone in your surprise. Hence the thread. That said, I have the tools to monitor incipient separation, and at least the first round of test-load brass, appears to be just fine. I think I'm going to do an experiment next on 12 each of virgin, neck turned virgin, and once fired. 1) Pin tumble 2) Measure case volume and dimensions 3) Run two powders and two bullets, 3 shots per recipe. It's 3X the supplies, and I hate to waste bullets (primers?) during these times, but I'd rather figure out the consequences of my actions and new equipment, sooner rather than later. [/QUOTE]
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Reloading
0.03" growth after first fire (264WM WW Brass)
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