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Rifles, Reloading, Optics, Equipment
Reloading
For Those That Weigh Brass
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<blockquote data-quote="Mikecr" data-source="post: 516523" data-attributes="member: 1521"><p>Bart B</p><p>I think your theory about cases of same weight holding same capacity -once expanded to the chamber walls, is somewhat true(minus weight from brass that doesn't expand to a chamber dimension).</p><p>Along with this, the chamber is part of a dynamic volume, ever increasing with bullet travel.</p><p>So you could argue(if your theory were true) that by the time a bullet travels 25" down a bore, the chamber itself is too small a percentage of total volume to matter much.</p><p>And still connecting your dots, since the bullet is released by neck expansion before it evens moves, and those necks always go to the same chamber dimension, then neck tension variance wouldn't matter much.</p><p></p><p>But, the affects of initial containment(volume) apply way before then, and this holds as significant to ignition and the timing of it.</p><p>Weigh out and load a case half full of powder, no bullet. Chamber it pointed up and fire –WUMP…</p><p>Now do the same but with a fold of tissue setting on the powder –BOOM.</p><p>This night & day difference was not expanded volume of the case to chamber, or a difference in powder amount. It was a change to INITIAL containment, which affects ignition timing right from the git-go. </p><p>Neck tension changes ignition because it varies containment/ignition timing(like the tissue), and so the pressure peak, and area applied.</p><p>Same with case volume, and fill density.</p><p></p><p>This can be seen across a chronograph, and shooters notice higher velocities from first firing of new brass, over second firing of it.</p><p>Yes this brass all went to nearly same capacity with it's first firing. But not before affecting ignition.</p><p>Wouldn't you agree?</p></blockquote><p></p>
[QUOTE="Mikecr, post: 516523, member: 1521"] Bart B I think your theory about cases of same weight holding same capacity -once expanded to the chamber walls, is somewhat true(minus weight from brass that doesn’t expand to a chamber dimension). Along with this, the chamber is part of a dynamic volume, ever increasing with bullet travel. So you could argue(if your theory were true) that by the time a bullet travels 25” down a bore, the chamber itself is too small a percentage of total volume to matter much. And still connecting your dots, since the bullet is released by neck expansion before it evens moves, and those necks always go to the same chamber dimension, then neck tension variance wouldn’t matter much. But, the affects of initial containment(volume) apply way before then, and this holds as significant to ignition and the timing of it. Weigh out and load a case half full of powder, no bullet. Chamber it pointed up and fire –WUMP… Now do the same but with a fold of tissue setting on the powder –BOOM. This night & day difference was not expanded volume of the case to chamber, or a difference in powder amount. It was a change to INITIAL containment, which affects ignition timing right from the git-go. Neck tension changes ignition because it varies containment/ignition timing(like the tissue), and so the pressure peak, and area applied. Same with case volume, and fill density. This can be seen across a chronograph, and shooters notice higher velocities from first firing of new brass, over second firing of it. Yes this brass all went to nearly same capacity with it’s first firing. But not before affecting ignition. Wouldn’t you agree? [/QUOTE]
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