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Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
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<blockquote data-quote="Pdvdh" data-source="post: 2097521" data-attributes="member: 4191"><p>No matter what you conclude about the likeness or difference in headspace dimension between the two differing cartridges, if you want to ensure the factory cases you use can be properly fire-formed without any stretching of the cases at their webs during fireforming, send several of the cases you want to use to the individual you select to chamber your barrel, and insist that they cut your chamber to a slight crush fit against the shoulder of your selected cases when the bolt closes. If this is anything other than the SAAMI specifications, they should not stamp your barrel "280 Ackley Improved", because that would imply the chamber complies with SAAMI chamber specifications. They could be held responsible if the customer is dissatisfied for whatever reason, after-the-fact. Or if a case wall should rupture when fired in that chamber.</p><p></p><p>So... if you ask them to chamber to the SAAMI 280 Ackley Improved, I expect most gunsmiths will only cut your chamber to match the SAAMI "280 Ackley Improved" headspace dimension (within those chamber headspace tolerances). Those chambers should be able to fire any factory cases headstamped 280 Ackley Improved.</p><p></p><p>If you require a chamber headspace dimension that falls outside the one and only SAAMI "280 Ackley Improved" headspace specifications, your barrel will almost certainly <strong><em>NOT</em></strong> be marked with the SAAMI "<strong>280 Ackley Improved</strong>".</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2097521, member: 4191"] No matter what you conclude about the likeness or difference in headspace dimension between the two differing cartridges, if you want to ensure the factory cases you use can be properly fire-formed without any stretching of the cases at their webs during fireforming, send several of the cases you want to use to the individual you select to chamber your barrel, and insist that they cut your chamber to a slight crush fit against the shoulder of your selected cases when the bolt closes. If this is anything other than the SAAMI specifications, they should not stamp your barrel "280 Ackley Improved", because that would imply the chamber complies with SAAMI chamber specifications. They could be held responsible if the customer is dissatisfied for whatever reason, after-the-fact. Or if a case wall should rupture when fired in that chamber. So... if you ask them to chamber to the SAAMI 280 Ackley Improved, I expect most gunsmiths will only cut your chamber to match the SAAMI "280 Ackley Improved" headspace dimension (within those chamber headspace tolerances). Those chambers should be able to fire any factory cases headstamped 280 Ackley Improved. If you require a chamber headspace dimension that falls outside the one and only SAAMI "280 Ackley Improved" headspace specifications, your barrel will almost certainly [B][I]NOT[/I][/B] be marked with the SAAMI "[B]280 Ackley Improved[/B]". [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
280 Ackley Chamber
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