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Rifles, Reloading, Optics, Equipment
Reloading
Revisiting: sorting cases by weight
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<blockquote data-quote="Mikecr" data-source="post: 1653014" data-attributes="member: 1521"><p>With our brass downsized to fit in our chambers there is the difference potential between initial and expanded area of containment, and also of confinement.</p><p>The downsized case provides a lower area of containment (initially).</p><p>It is also less confining (initially) in that it will expand with case resistance only -until reaching the chamber walls.</p><p></p><p>You might think that a sized smaller case would increase load density for a given charge and this would raise pressure. Very possible, depending on chamber fit.</p><p>With a tight chamber fit, relative confinement is higher, and if a smaller area of containment is set to that tighter fit, then pressure will go up.</p><p>But many folks run with loose chamber clearances. This acts to reduce the pressure peak. To flatten it. Apparently, a significant portion of a pressure peak is consumed to expand cases to chamber walls. Then, I imagine, when the case hits higher confinement of the chamber walls, and depending on bullet travel timing, pressure could rise again.</p><p></p><p>The jest of my concern here is that capacity affects pressure peaks. Therefore, variance of capacity could vary my pressure peaks. So I don't care what cases weigh, I want the same capacities, <u>and</u> same fit & form.</p><p></p><p>Next, you need to understand all that is behind achieving this.</p><p>When you do, you'll know that separating cases by weight instead of capacity doesn't really help, and can actually be detrimental to your intent.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1653014, member: 1521"] With our brass downsized to fit in our chambers there is the difference potential between initial and expanded area of containment, and also of confinement. The downsized case provides a lower area of containment (initially). It is also less confining (initially) in that it will expand with case resistance only -until reaching the chamber walls. You might think that a sized smaller case would increase load density for a given charge and this would raise pressure. Very possible, depending on chamber fit. With a tight chamber fit, relative confinement is higher, and if a smaller area of containment is set to that tighter fit, then pressure will go up. But many folks run with loose chamber clearances. This acts to reduce the pressure peak. To flatten it. Apparently, a significant portion of a pressure peak is consumed to expand cases to chamber walls. Then, I imagine, when the case hits higher confinement of the chamber walls, and depending on bullet travel timing, pressure could rise again. The jest of my concern here is that capacity affects pressure peaks. Therefore, variance of capacity could vary my pressure peaks. So I don't care what cases weigh, I want the same capacities, [U]and[/U] same fit & form. Next, you need to understand all that is behind achieving this. When you do, you'll know that separating cases by weight instead of capacity doesn't really help, and can actually be detrimental to your intent. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Revisiting: sorting cases by weight
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