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<blockquote data-quote="azsugarbear" data-source="post: 1217799" data-attributes="member: 4809"><p>I can't point you to any specific studies off the top of my head, but it is generally held that the AI configuration with the steep angled shoulders tends to keep more of the burning powder inside the case longer. This was not one of the reasons Ackley designed his specific profile, but rather one of the unintended consequences. Perhaps others will chime in to cite their experiences. The main benefits of the Ackley design are: lower back pressure on the bolt; increased performance (velocity) and no length trimming (stops forward flow of brass during firing).</p></blockquote><p></p>
[QUOTE="azsugarbear, post: 1217799, member: 4809"] I can't point you to any specific studies off the top of my head, but it is generally held that the AI configuration with the steep angled shoulders tends to keep more of the burning powder inside the case longer. This was not one of the reasons Ackley designed his specific profile, but rather one of the unintended consequences. Perhaps others will chime in to cite their experiences. The main benefits of the Ackley design are: lower back pressure on the bolt; increased performance (velocity) and no length trimming (stops forward flow of brass during firing). [/QUOTE]
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