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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
. 35 Whelan A.I. data with 250 gr. and 2700, Vit. 140
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<blockquote data-quote="sable tireur" data-source="post: 1481004" data-attributes="member: 27307"><p>With respect,</p><p></p><p>There are a couple of things to remember regarding the Ackley Improved style cartridges:</p><p></p><p>1 - You can use a fairly stout (upper end load) from the parent cartridge to fireform because the case gets bigger during this process, allowing the pressure to fall lower.</p><p></p><p>2 - Ackley Improved cartridges do NOT show signs of pressure like normal cartridges until the pressure is too high and there is a failure. This is why many folks report much higher velocities from AI testing than when the pressure is monitored through a pressure sensor. </p><p></p><p>I believe this is where we're seeing numbers like the 2,850 fps with a 225 gr. bullet. The difference between 225 and 250 is not enough to see a 250 FPS change from book figures. </p><p></p><p>Rational pressures should yield somewhere around 2,600 and 2,650 FPS depending on the powder type and charge weight.</p><p></p><p>I just finished building 3 of these and the testing with 250 grain Partitions was right around 2,650 FPS.</p><p></p><p>Regards.</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1481004, member: 27307"] With respect, There are a couple of things to remember regarding the Ackley Improved style cartridges: 1 - You can use a fairly stout (upper end load) from the parent cartridge to fireform because the case gets bigger during this process, allowing the pressure to fall lower. 2 - Ackley Improved cartridges do NOT show signs of pressure like normal cartridges until the pressure is too high and there is a failure. This is why many folks report much higher velocities from AI testing than when the pressure is monitored through a pressure sensor. I believe this is where we're seeing numbers like the 2,850 fps with a 225 gr. bullet. The difference between 225 and 250 is not enough to see a 250 FPS change from book figures. Rational pressures should yield somewhere around 2,600 and 2,650 FPS depending on the powder type and charge weight. I just finished building 3 of these and the testing with 250 grain Partitions was right around 2,650 FPS. Regards. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
. 35 Whelan A.I. data with 250 gr. and 2700, Vit. 140
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