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Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
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<blockquote data-quote="Pdvdh" data-source="post: 2101209" data-attributes="member: 4191"><p>I'm going to quote a member who was a stickler for detail, and who identified the difference in headspace dimensions between the traditional 280 AI and Nosler's SAAMI approved version - the "280 Ackley Improved" very shortly after Nosler's version was christened by SAAMI.</p><p></p><p>Take note that J E stated in two different posts that most bolt actions will close on a cartridge that headspaces off the shoulder, even if the chamber is 0.014" shorter in headspace dimension than the cartridge was designed for. So the fact that 280 Remington cartridges can be chambered in a bolt rifle chambered for the SAAMI "280 Ackley Improved" doesn't appear to be significant in determining whether or not there's a 0.014" difference in headspace dimension between the SAAMI "280 Remington" and the SAAMI "280 Ackley Improved".</p><p></p><p><strong>Most notable</strong>, J E also stated that he talked to the reamer manufacturers and they told him: "THERE ARE TWO DIFFERENT GO GAGES FOR THE TWO DIFFERENT TYPES OF BRASS/chambers".</p><p></p><p>I find nothing in 25WSM's last post that's eliminates the potential for the 0.014" difference in headspace between the traditional 280 AI and the SAAMI "280 Ackley Improved". The Nosler article didn't speak to the likeness, or the difference, between a P.O. Ackley traditional 280 AI and their version - the 280 Ackley Improved. Can't blame them for avoiding any speak on that topic. They, with SAAMI's blessing, named their cartridge 280 <strong>Ackley</strong> Improved, even though it's not the P.O. Ackley version that had preceded their version by decades.</p><p></p><p>J E Custom... Rest in Peace.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2101209, member: 4191"] I'm going to quote a member who was a stickler for detail, and who identified the difference in headspace dimensions between the traditional 280 AI and Nosler's SAAMI approved version - the "280 Ackley Improved" very shortly after Nosler's version was christened by SAAMI. Take note that J E stated in two different posts that most bolt actions will close on a cartridge that headspaces off the shoulder, even if the chamber is 0.014" shorter in headspace dimension than the cartridge was designed for. So the fact that 280 Remington cartridges can be chambered in a bolt rifle chambered for the SAAMI "280 Ackley Improved" doesn't appear to be significant in determining whether or not there's a 0.014" difference in headspace dimension between the SAAMI "280 Remington" and the SAAMI "280 Ackley Improved". [B]Most notable[/B], J E also stated that he talked to the reamer manufacturers and they told him: "THERE ARE TWO DIFFERENT GO GAGES FOR THE TWO DIFFERENT TYPES OF BRASS/chambers". I find nothing in 25WSM's last post that's eliminates the potential for the 0.014" difference in headspace between the traditional 280 AI and the SAAMI "280 Ackley Improved". The Nosler article didn't speak to the likeness, or the difference, between a P.O. Ackley traditional 280 AI and their version - the 280 Ackley Improved. Can't blame them for avoiding any speak on that topic. They, with SAAMI's blessing, named their cartridge 280 [B]Ackley[/B] Improved, even though it's not the P.O. Ackley version that had preceded their version by decades. J E Custom... Rest in Peace. [/QUOTE]
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280 Ackley Chamber
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