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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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<blockquote data-quote="JWM" data-source="post: 1914961" data-attributes="member: 22049"><p>A more efficient case will give more velocity with the same powder charge, bullet and primer, or the same velocity with less powder, if the term means anything; and possibly better accuracy potential from more consistency. Or, without the condition of the same case capacity, a .223 is more efficient than a .220 swift, because you get roughly 2/3 of the velocity with half the powder. That's the law of diminishing returns. A major factor in efficiency is how much powder follows the bullet down the barrel, you have to accelerate that additional weight, too. A short fat case with a sharp shoulder should burn more of the powder in the case, less in the barrel, and be more efficient. Some use primer tubes that start the powder burning in the front half of the case for the same reason.</p></blockquote><p></p>
[QUOTE="JWM, post: 1914961, member: 22049"] A more efficient case will give more velocity with the same powder charge, bullet and primer, or the same velocity with less powder, if the term means anything; and possibly better accuracy potential from more consistency. Or, without the condition of the same case capacity, a .223 is more efficient than a .220 swift, because you get roughly 2/3 of the velocity with half the powder. That's the law of diminishing returns. A major factor in efficiency is how much powder follows the bullet down the barrel, you have to accelerate that additional weight, too. A short fat case with a sharp shoulder should burn more of the powder in the case, less in the barrel, and be more efficient. Some use primer tubes that start the powder burning in the front half of the case for the same reason. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Understanding cartridge efficiency
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