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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Which is the better Ackley
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<blockquote data-quote="J E Custom" data-source="post: 1170020" data-attributes="member: 2736"><p>This has been a long time debate and I don't want to start it over again but I prefer the "Old"</p><p>version of the 280 AI because you can use the more common 280 Rem Brass made buy many different ammo/brass makers. </p><p></p><p>When chambering this way, we reduce the head space .003 to .004 less than the 280 and fire forming is straight forward.</p><p></p><p>If you go with the "new" Nosler, the chamber is .014 shorter than the 280 rem (.018 - .004</p><p>= .014) and you should shoot only the Nosler brass or there ammo in that chamber at a much higher price. </p><p></p><p><a href="http://www.saami.org/PubResources/CC_Drawings/Rifle/280%20Remington%20-%207mm%20Express.pdf" target="_blank">http://www.saami.org/PubResources/CC_Drawings/Rifle/280 Remington - 7mm Express.pdf</a></p><p></p><p><a href="http://www.saami.org/PubResources/CC_Drawings/Rifle/280%20Ackley%20Improved.pdf" target="_blank">http://www.saami.org/PubResources/CC_Drawings/Rifle/280 Ackley Improved.pdf</a></p><p></p><p>If you look at the SAMME chamber drawings (The bottom drawing)you can see the difference in the 280 Rem case head to shoulder neck junction is 2.192 and the Nosler version Is 2.1742 (.018 shorter. Shooting factory 280 rem ammo in this chamber is almost impossible without heavy bolt</p><p>closing so you would be confined to using the Nosler brass and ammo.</p><p></p><p>Note: the same reamer is/can be used, it is just a matter of head space difference.</p><p></p><p>There is no power/velocity difference, just ammo and brass availability.</p><p></p><p>As far as the advantage of a 40o over a 30o shoulder, PO Ackley tested from 25o to 50o shoulders and came to the conclusion that 40o shoulders seemed </p><p>to be the most efficient and brass life was optimum. Less shoulder angle is thought to feed better by some but I have never had a problem with 40o shoulders feeding and brass life is definitely better.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1170020, member: 2736"] This has been a long time debate and I don't want to start it over again but I prefer the "Old" version of the 280 AI because you can use the more common 280 Rem Brass made buy many different ammo/brass makers. When chambering this way, we reduce the head space .003 to .004 less than the 280 and fire forming is straight forward. If you go with the "new" Nosler, the chamber is .014 shorter than the 280 rem (.018 - .004 = .014) and you should shoot only the Nosler brass or there ammo in that chamber at a much higher price. [url]http://www.saami.org/PubResources/CC_Drawings/Rifle/280%20Remington%20-%207mm%20Express.pdf[/url] [url]http://www.saami.org/PubResources/CC_Drawings/Rifle/280%20Ackley%20Improved.pdf[/url] If you look at the SAMME chamber drawings (The bottom drawing)you can see the difference in the 280 Rem case head to shoulder neck junction is 2.192 and the Nosler version Is 2.1742 (.018 shorter. Shooting factory 280 rem ammo in this chamber is almost impossible without heavy bolt closing so you would be confined to using the Nosler brass and ammo. Note: the same reamer is/can be used, it is just a matter of head space difference. There is no power/velocity difference, just ammo and brass availability. As far as the advantage of a 40o over a 30o shoulder, PO Ackley tested from 25o to 50o shoulders and came to the conclusion that 40o shoulders seemed to be the most efficient and brass life was optimum. Less shoulder angle is thought to feed better by some but I have never had a problem with 40o shoulders feeding and brass life is definitely better. J E CUSTOM [/QUOTE]
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Which is the better Ackley
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