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Rifles, Reloading, Optics, Equipment
Reloading
Unfired SD/ES better than 1x Fired SD/es
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<blockquote data-quote="918v" data-source="post: 1007368" data-attributes="member: 84964"><p>I used to think that too. It's not the virgin case capacity. Case capacity is only relevant when measured against your chamber dimensions. You should only care about fireformed case capacity.</p><p></p><p>The reason why fireformed case velocity is higher is because the powder does not have to expell energy to fireform the case to the chamber. That amount of energy is instead used to propell the bullet. Hence, the velocity is higher. </p><p></p><p>Why is the ES higher? It could be your scale is not repeatable and the initial low ES was a fluke. Could be that the neck is no longer as clean and soft as when it was new and the tension on the bullet is not as consistent. It also could be that particular powder charge does not generate a small ES in fireformed brass. You may need to tweak it. </p><p></p><p>A lot of variables influence ES. It's not just powder charge consistency.</p></blockquote><p></p>
[QUOTE="918v, post: 1007368, member: 84964"] I used to think that too. It's not the virgin case capacity. Case capacity is only relevant when measured against your chamber dimensions. You should only care about fireformed case capacity. The reason why fireformed case velocity is higher is because the powder does not have to expell energy to fireform the case to the chamber. That amount of energy is instead used to propell the bullet. Hence, the velocity is higher. Why is the ES higher? It could be your scale is not repeatable and the initial low ES was a fluke. Could be that the neck is no longer as clean and soft as when it was new and the tension on the bullet is not as consistent. It also could be that particular powder charge does not generate a small ES in fireformed brass. You may need to tweak it. A lot of variables influence ES. It's not just powder charge consistency. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Unfired SD/ES better than 1x Fired SD/es
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