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Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
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<blockquote data-quote="Pdvdh" data-source="post: 2096528" data-attributes="member: 4191"><p>The math and Redding do say no. I've done the math myself and it's 0.014" no-go difference in headspace between the two. </p><p>Decide which one you want and proceed. if you intend to use brass manufactured for the newer SAAMI 280 AI specs don't wanna fuss with fire-forming to the 0.014" longer headspaced traditional Ackley chamber, then better headspace your chamber to the SAAMI spec.</p><p></p><p>I got into a real shootout on the Shooters' Forum with some '<em>experts</em>' that all proved to be less than expert. The entire Thread was eventually deleted after I embarrassed some of that Forum's longstanding 'experts' who claimed there was no difference in headspace dimension between the traditional 280 Ackely and the SAAMI 280 AI. Somehow those experts convinced themselves that Redding, who's been manufacturing reloading dies since Adam and Eve, was wrong about the 0.014" headspace difference. Been in business forever, and Redding continues to stand by their correct description of the 0.014" difference. It was all too funny when all was said and done.</p><p></p><p><strong>shortgrass</strong> followed that now-deleted Thread. <strong>shortgrass</strong> has it 100% correct.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2096528, member: 4191"] The math and Redding do say no. I've done the math myself and it's 0.014" no-go difference in headspace between the two. Decide which one you want and proceed. if you intend to use brass manufactured for the newer SAAMI 280 AI specs don't wanna fuss with fire-forming to the 0.014" longer headspaced traditional Ackley chamber, then better headspace your chamber to the SAAMI spec. I got into a real shootout on the Shooters' Forum with some '[I]experts[/I]' that all proved to be less than expert. The entire Thread was eventually deleted after I embarrassed some of that Forum's longstanding 'experts' who claimed there was no difference in headspace dimension between the traditional 280 Ackely and the SAAMI 280 AI. Somehow those experts convinced themselves that Redding, who's been manufacturing reloading dies since Adam and Eve, was wrong about the 0.014" headspace difference. Been in business forever, and Redding continues to stand by their correct description of the 0.014" difference. It was all too funny when all was said and done. [B]shortgrass[/B] followed that now-deleted Thread. [B]shortgrass[/B] has it 100% correct. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
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