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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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<blockquote data-quote="antelopedundee" data-source="post: 1915204" data-attributes="member: 107384"><p>Probably using less powder in one to obtain the same velocity within allowable pressures. Of course if the load doesn't "shoot" it's sorta moot.</p><p></p><p>Take something like a 284 Win case and shorten it by half and increase the diameter so that the volumes are equal to the base of the neck. The .284 S & F [Short & Fat] could turn out to be a more efficient design, but not worth the bother from a production standpoint or even a wildcat/gunsmithing standpoint.</p><p></p><p>P O Ackley demonstrated with the 6.5-06 to 6.5-06AI that maximum efficiency was reached at the 6.5-06 point, but lots of folks [me included] like the AI version. I don't know if anyone after him bumped the AI shoulder back until case capacity equaled that of the base 6.5-06 and then did a comparison. If the 6.5-06AIS Ackley Improved Short turned out to be more efficient the best pro that could result would be if someone would commercialize it. If not, the wildcatters and free spirits would probably enjoy its benefit/s just because they could.</p></blockquote><p></p>
[QUOTE="antelopedundee, post: 1915204, member: 107384"] Probably using less powder in one to obtain the same velocity within allowable pressures. Of course if the load doesn't "shoot" it's sorta moot. Take something like a 284 Win case and shorten it by half and increase the diameter so that the volumes are equal to the base of the neck. The .284 S & F [Short & Fat] could turn out to be a more efficient design, but not worth the bother from a production standpoint or even a wildcat/gunsmithing standpoint. P O Ackley demonstrated with the 6.5-06 to 6.5-06AI that maximum efficiency was reached at the 6.5-06 point, but lots of folks [me included] like the AI version. I don't know if anyone after him bumped the AI shoulder back until case capacity equaled that of the base 6.5-06 and then did a comparison. If the 6.5-06AIS Ackley Improved Short turned out to be more efficient the best pro that could result would be if someone would commercialize it. If not, the wildcatters and free spirits would probably enjoy its benefit/s just because they could. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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