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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ackley Improved
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<blockquote data-quote="Jamie6.5" data-source="post: 281409" data-attributes="member: 16954"><p>Generally "no." They will however generate less bolt thrust. That is, the straighter case walls (less taper) are credited with gripping the chamber better and as a result, less rearward force is exerted on the bolt.</p><p>As far as overall pressure goes, in the earlier cartridges, P.O. ran more pressure than factory loadings. The reduced bolt thrust supposedly gave him a larger safety window.</p><p>Later loadings, such as the .257 Roberts+P made up for most of the gains of early Ackley chamberings. There are still advantages to most Ackley chamberings though. Especially the more unique ones.</p><p></p><p>I have a chambering of the 6.5x.257 Roberts Ackley with the 40* shoulder that is my favorite. P.O. referred to the round as the .260AAR. AAR stands for all around rifle. It is one amazing round. .270 performance, 6-10 fewer grains of powder and .243 recoil. Very efficient, 150-200 FPS higher velocity than the .260 Rem, just as accurate and handles the really long 6.5 bullets better due to it's longer neck. </p><p></p><p>Hope that helps.</p></blockquote><p></p>
[QUOTE="Jamie6.5, post: 281409, member: 16954"] Generally "no." They will however generate less bolt thrust. That is, the straighter case walls (less taper) are credited with gripping the chamber better and as a result, less rearward force is exerted on the bolt. As far as overall pressure goes, in the earlier cartridges, P.O. ran more pressure than factory loadings. The reduced bolt thrust supposedly gave him a larger safety window. Later loadings, such as the .257 Roberts+P made up for most of the gains of early Ackley chamberings. There are still advantages to most Ackley chamberings though. Especially the more unique ones. I have a chambering of the 6.5x.257 Roberts Ackley with the 40* shoulder that is my favorite. P.O. referred to the round as the .260AAR. AAR stands for all around rifle. It is one amazing round. .270 performance, 6-10 fewer grains of powder and .243 recoil. Very efficient, 150-200 FPS higher velocity than the .260 Rem, just as accurate and handles the really long 6.5 bullets better due to it's longer neck. Hope that helps. [/QUOTE]
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Ackley Improved
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