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280 AI alert
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<blockquote data-quote="Pdvdh" data-source="post: 2102218" data-attributes="member: 4191"><p>I didn't think, or know, there was any substantial difference in the breech face SAAMI chamber diameters of the 7mm-08, 280 Rem, 280 Ackley Imp, 308 Win, or 30-06 Springfield.</p><p></p><p>So out of curiousity, I researched SAAMI chamber specs for the breech face diameters all of these SAAMI adopted cartridges. There are some slight differences. Only LRI could decide if the differences preclude their ability to agree to your request for such a re-chambering.</p><p></p><p><u>Diameters at Breech Face</u>. . . . <u>Diameters 0.200" forward of Breech Face</u></p><p><span style="color: rgb(41, 105, 176)">7mm-08</span>_ _ _ _ _ <span style="color: rgb(41, 105, 176)">0.4738</span>". . . . . . <span style="color: rgb(41, 105, 176)">0.4714</span>"</p><p><span style="color: rgb(41, 105, 176)">280 Rem</span>_ _ _ _ _ <span style="color: rgb(41, 105, 176)">0.4747</span>" . . . . . <span style="color: rgb(41, 105, 176)">0.4714</span>"</p><p><span style="color: rgb(209, 72, 65)">280 Ack Imp</span> _ _ <span style="color: rgb(209, 72, 65)">0.4727</span>" . . . . . <span style="color: rgb(209, 72, 65)">0.4710</span>"</p><p>308 Win _ _ _ _ _0.4738" . . . . . 0.4714"</p><p>30-06 Sprng _ _ 0.4740" . . . . . 0.4708"</p><p></p><p>I couldn't see any issue rechambering to the traditional 280 AI. Because the parent case, the <span style="color: rgb(41, 105, 176)">280 Rem</span> diameters are the same at the 0.200" datum, and 0.0009" larger in diameter than the <span style="color: rgb(41, 105, 176)">7mm-08</span> at the breech face. But you would then have to fire form 280 Rem casings to 280 AI, rather than using the pre-formed 280 Ackley Improved casings available for Nosler's SAAMI version.</p><p></p><p>Evidently, Nosler also messed with the breech face diameter when pursuing SAAMI adoption of their "<span style="color: rgb(209, 72, 65)">280 Ackley Improved</span>". It's actually only 0.002" smaller in diameter at the breech face than the 280 Rem & traditional 280 AI.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2102218, member: 4191"] I didn't think, or know, there was any substantial difference in the breech face SAAMI chamber diameters of the 7mm-08, 280 Rem, 280 Ackley Imp, 308 Win, or 30-06 Springfield. So out of curiousity, I researched SAAMI chamber specs for the breech face diameters all of these SAAMI adopted cartridges. There are some slight differences. Only LRI could decide if the differences preclude their ability to agree to your request for such a re-chambering. [U]Diameters at Breech Face[/U]. . . . [U]Diameters 0.200" forward of Breech Face[/U] [COLOR=rgb(41, 105, 176)]7mm-08[/COLOR]_ _ _ _ _ [COLOR=rgb(41, 105, 176)]0.4738[/COLOR]". . . . . . [COLOR=rgb(41, 105, 176)]0.4714[/COLOR]" [COLOR=rgb(41, 105, 176)]280 Rem[/COLOR]_ _ _ _ _ [COLOR=rgb(41, 105, 176)]0.4747[/COLOR]" . . . . . [COLOR=rgb(41, 105, 176)]0.4714[/COLOR]" [COLOR=rgb(209, 72, 65)]280 Ack Imp[/COLOR] _ _ [COLOR=rgb(209, 72, 65)]0.4727[/COLOR]" . . . . . [COLOR=rgb(209, 72, 65)]0.4710[/COLOR]" 308 Win _ _ _ _ _0.4738" . . . . . 0.4714" 30-06 Sprng _ _ 0.4740" . . . . . 0.4708" I couldn't see any issue rechambering to the traditional 280 AI. Because the parent case, the [COLOR=rgb(41, 105, 176)]280 Rem[/COLOR] diameters are the same at the 0.200" datum, and 0.0009" larger in diameter than the [COLOR=rgb(41, 105, 176)]7mm-08[/COLOR] at the breech face. But you would then have to fire form 280 Rem casings to 280 AI, rather than using the pre-formed 280 Ackley Improved casings available for Nosler's SAAMI version. Evidently, Nosler also messed with the breech face diameter when pursuing SAAMI adoption of their "[COLOR=rgb(209, 72, 65)]280 Ackley Improved[/COLOR]". It's actually only 0.002" smaller in diameter at the breech face than the 280 Rem & traditional 280 AI. [/QUOTE]
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