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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ackley Improved Are Not A Problem!
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<blockquote data-quote="Wallie" data-source="post: 2743253" data-attributes="member: 107256"><p>I couldn't agree more! You must have that usb cable out again!</p><p>I noticed a big difference between the chamber being headspaced with the parent cartridge go/no go and with the AI gauge. The AI go gauge is the same length as the parent no go, and the no go is .004" longer than that… the reason is so that a gunsmith can completely clean a parent chamber with an AI reamer. </p><p>When chambering my new barrel blanks I started setting headspace with the parent gauges, and to the minimum tolerance at that (0.004" length difference between go and no go) so that when fireforming new brass I would minimize case stretch. This allowed me to develop a fire form load that wasn't jammed into the lands, and I found that accuracy was excellent! </p><p>I also found that the pressure in these fire form loads "acted" as if the case volume had already been increased to AI, but obviously I could only fit as much powder as the unfired parent case would hold. </p><p>The only negative characteristic I could attribute to fireform loads was a slightly increased velocity extreme spread. </p><p></p><p>I LOVE Ackley improved cartridges, 223AI is my favorite, 260AI, 243AI, 22-250AI are all a close second.</p></blockquote><p></p>
[QUOTE="Wallie, post: 2743253, member: 107256"] I couldn’t agree more! You must have that usb cable out again! I noticed a big difference between the chamber being headspaced with the parent cartridge go/no go and with the AI gauge. The AI go gauge is the same length as the parent no go, and the no go is .004” longer than that… the reason is so that a gunsmith can completely clean a parent chamber with an AI reamer. When chambering my new barrel blanks I started setting headspace with the parent gauges, and to the minimum tolerance at that (0.004” length difference between go and no go) so that when fireforming new brass I would minimize case stretch. This allowed me to develop a fire form load that wasn’t jammed into the lands, and I found that accuracy was excellent! I also found that the pressure in these fire form loads “acted” as if the case volume had already been increased to AI, but obviously I could only fit as much powder as the unfired parent case would hold. The only negative characteristic I could attribute to fireform loads was a slightly increased velocity extreme spread. I LOVE Ackley improved cartridges, 223AI is my favorite, 260AI, 243AI, 22-250AI are all a close second. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Ackley Improved Are Not A Problem!
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