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Rifles, Reloading, Optics, Equipment
Reloading
Best powder for short barreled 308
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<blockquote data-quote="boomtube" data-source="post: 796057" data-attributes="member: 9215"><p>"I disagree with the statement about a powder will produce top velocity in a long barrel as it will a short barrel. If that were the case there'd be no point to having different burn rates for powders."</p><p> </p><p>"Disagree" as you like, it's still a fact. Chamber pressure peaks when a bullet gets about 3 inches from the chamber and it falls quite fast after that because the combustion space is rapidly expanding. The most efficient bore time<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue :p" loading="lazy" data-shortname=":p" />ressure curve is the same no matter when the bullet exits; use a faster powder and pressure both rises and falls faster and the average pressure is also less. Speed is higher with a longer barrel only because the bullets continue to accelerate full bore length so the highest average pressure makes bullets fly faster in any barrel length.</p><p> </p><p>Powders have different burn rates because of different capacity and different shaped cases driving different bullet weights down different diameter bores, not to accommidate different barrel lengths. And, it's not uncommon for the highest velocity/pressure curve to not produce the best/most accurate barrel harmonics but that's a different issue.</p></blockquote><p></p>
[QUOTE="boomtube, post: 796057, member: 9215"] "I disagree with the statement about a powder will produce top velocity in a long barrel as it will a short barrel. If that were the case there'd be no point to having different burn rates for powders." "Disagree" as you like, it's still a fact. Chamber pressure peaks when a bullet gets about 3 inches from the chamber and it falls quite fast after that because the combustion space is rapidly expanding. The most efficient bore time:pressure curve is the same no matter when the bullet exits; use a faster powder and pressure both rises and falls faster and the average pressure is also less. Speed is higher with a longer barrel only because the bullets continue to accelerate full bore length so the highest average pressure makes bullets fly faster in any barrel length. Powders have different burn rates because of different capacity and different shaped cases driving different bullet weights down different diameter bores, not to accommidate different barrel lengths. And, it's not uncommon for the highest velocity/pressure curve to not produce the best/most accurate barrel harmonics but that's a different issue. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Best powder for short barreled 308
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