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Rifles, Reloading, Optics, Equipment
Gunsmithing
6.5x284?
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<blockquote data-quote="Trickymissfit" data-source="post: 533328" data-attributes="member: 25383"><p>I think we're talking apples & oranges. The 57mm case is slightly longer at the shoulder, and the neck is close enough to be the same. The shoulder on the Ackley is much straiter with less taper that the 6.5x55. Ackley dosn't list any data on the 6.5x57AI, but does list it for the Apex which is a very similar cartridge. He got 2880fps with 53.0 grains of H450. That's roughly 200fps faster than the max loads with the same bullet in the 6.5x55. But of course you could improve the 6.5x55 as well. I suspect with some of the newer powders the difference would be closer to 275fps in a 26" barrel.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 533328, member: 25383"] I think we're talking apples & oranges. The 57mm case is slightly longer at the shoulder, and the neck is close enough to be the same. The shoulder on the Ackley is much straiter with less taper that the 6.5x55. Ackley dosn't list any data on the 6.5x57AI, but does list it for the Apex which is a very similar cartridge. He got 2880fps with 53.0 grains of H450. That's roughly 200fps faster than the max loads with the same bullet in the 6.5x55. But of course you could improve the 6.5x55 as well. I suspect with some of the newer powders the difference would be closer to 275fps in a 26" barrel. gary [/QUOTE]
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