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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ackley Improved vs Parent Case
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<blockquote data-quote="Mikecr" data-source="post: 633669" data-attributes="member: 1521"><p>As JE implies cartridge design and gun design as a system, is complicated much like engine designing. Any shade tree mechanic can combine parts to make pure junk.</p><p>But that's more abstract than design.</p><p></p><p>Cases are improved for much more than capacity, and some improvements are actually designed to reduce capacity(like a 6xc over a 243win) for use of faster powders with given bullets. Most improvements begin with a reamer print, and appropriate reloading plan(case forming, fireforming, sizing, action, barrel, etc, with a specific bullet and powder in mind).</p><p></p><p>Brit, to the original question, 'Ackley' improvements do increase capacity, as well as reducing body taper, and increasing shoulder angle.</p><p>And with your example of a standard 25-06REM, H4831, 100gr bullet @ 3200fps:</p><p>-It has an H20 capacity of ~66gr, and your load would be~57gr H831sc from a 26" barrel. This is already a very low pressure load @ ~50Kpsi.</p><p></p><p>-Changing only to AI capacity(~71grH20), Pressure drops to ~43Kpsi, and MV drops to ~3070fps.</p><p>Regaining velocity(which you're allowing) means adjusting load to 59.3gr of H4831sc, and this does provide 3200fps @ ~48Kpsi (a 2Kpsi drop in pressure).</p><p></p><p>So the answer in this case is YES</p></blockquote><p></p>
[QUOTE="Mikecr, post: 633669, member: 1521"] As JE implies cartridge design and gun design as a system, is complicated much like engine designing. Any shade tree mechanic can combine parts to make pure junk. But that's more abstract than design. Cases are improved for much more than capacity, and some improvements are actually designed to reduce capacity(like a 6xc over a 243win) for use of faster powders with given bullets. Most improvements begin with a reamer print, and appropriate reloading plan(case forming, fireforming, sizing, action, barrel, etc, with a specific bullet and powder in mind). Brit, to the original question, 'Ackley' improvements do increase capacity, as well as reducing body taper, and increasing shoulder angle. And with your example of a standard 25-06REM, H4831, 100gr bullet @ 3200fps: -It has an H20 capacity of ~66gr, and your load would be~57gr H831sc from a 26" barrel. This is already a very low pressure load @ ~50Kpsi. -Changing only to AI capacity(~71grH20), Pressure drops to ~43Kpsi, and MV drops to ~3070fps. Regaining velocity(which you're allowing) means adjusting load to 59.3gr of H4831sc, and this does provide 3200fps @ ~48Kpsi (a 2Kpsi drop in pressure). So the answer in this case is YES [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Ackley Improved vs Parent Case
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