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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
280 ack imp 40 degrees vs Nosler brass
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<blockquote data-quote="varmintH8R" data-source="post: 802949" data-attributes="member: 39801"><p>And that, sir, is the real question here. This thread started with evidence that the "original" PO Ackley chamber and the SAAMI chamber are actually the same, and the reported 14 thou difference in case length was incorrectly determined by where the measurements are indexed. Members came in with experience with Nosler 280AI brass: some agreed, some said they measured 6 thou, some said it was 14 as reported. I think it is fair to say there is no concrete resolution to this (at least in my mind).</p><p></p><p>To directly answer your question, if indeed your chamber was 14 thou longer to the shoulder than 280AI factory brass, firing it will fit it to your chamber. But keep in mind, that material needs to come from somewhere to allow it to stretch. By necessity, stretching the case longer will thin the case wall. The hope is it thins uniformly. Worst case is it localizes near the case head, and after a few loadings you have a potentially dangerous (or at least scary) situation. To use your quote above, you might eventually "blow it out".</p><p></p><p>This is my opinion and not science: 14 thou, if real, is beyond my comfort level for excess headspace. When in doubt, I err on the side of caution. I will continue to fire-form from 280 brass, or I will measure 280AI factory brass headspace relative to my fireformed brass before using it.</p></blockquote><p></p>
[QUOTE="varmintH8R, post: 802949, member: 39801"] And that, sir, is the real question here. This thread started with evidence that the "original" PO Ackley chamber and the SAAMI chamber are actually the same, and the reported 14 thou difference in case length was incorrectly determined by where the measurements are indexed. Members came in with experience with Nosler 280AI brass: some agreed, some said they measured 6 thou, some said it was 14 as reported. I think it is fair to say there is no concrete resolution to this (at least in my mind). To directly answer your question, if indeed your chamber was 14 thou longer to the shoulder than 280AI factory brass, firing it will fit it to your chamber. But keep in mind, that material needs to come from somewhere to allow it to stretch. By necessity, stretching the case longer will thin the case wall. The hope is it thins uniformly. Worst case is it localizes near the case head, and after a few loadings you have a potentially dangerous (or at least scary) situation. To use your quote above, you might eventually "blow it out". This is my opinion and not science: 14 thou, if real, is beyond my comfort level for excess headspace. When in doubt, I err on the side of caution. I will continue to fire-form from 280 brass, or I will measure 280AI factory brass headspace relative to my fireformed brass before using it. [/QUOTE]
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280 ack imp 40 degrees vs Nosler brass
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