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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Kinda torn!!! Build advice
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<blockquote data-quote="Wolf76" data-source="post: 2369450" data-attributes="member: 75779"><p>The short answer is "yes". This is a physics question that is fortunately easier to explain. There are 2 main factors that come into play here. The first basic premise is smokeless powders turn into a gas and become a propellant, not and explosive like black powder. The gas pressure pushes the bullet down the bore. But it takes a certain amount of PSI(some reference 15K or more) to actually move the bullet. This is because of the interference caused by the bullet being forced down the bore.</p><p>Now to answer the question:</p><p>There is peak pressure and AUC (area under the curve). For optimal performance we need to be at safe peak pressure while having the gas volume to keep the pressure behind the bullet at 15K+PSI[ATTACH=full]320750[/ATTACH]. There are a number of powders that can generate peak pressure for most rifle cartridges, but only a certain burn rate will allow enough powder burned to achieve the gas volume necessary for peak velocities. With a larger case capacity, you can use slower burning powders that generate the same peak pressure and maintain 15K+ PSI longer. Also keep in mind that peak pressure is relative to burn rate and case capacity. </p><p>Example 308W vs 300wm. If loaded to the same pressure, the 300 wm wins by a mile. Only real difference is case capacity. </p><p>I'm attaching a chart which illustrates what I'm attempting to example. Compare lines 1 and 3.[ATTACH=full]320750[/ATTACH]</p></blockquote><p></p>
[QUOTE="Wolf76, post: 2369450, member: 75779"] The short answer is "yes". This is a physics question that is fortunately easier to explain. There are 2 main factors that come into play here. The first basic premise is smokeless powders turn into a gas and become a propellant, not and explosive like black powder. The gas pressure pushes the bullet down the bore. But it takes a certain amount of PSI(some reference 15K or more) to actually move the bullet. This is because of the interference caused by the bullet being forced down the bore. Now to answer the question: There is peak pressure and AUC (area under the curve). For optimal performance we need to be at safe peak pressure while having the gas volume to keep the pressure behind the bullet at 15K+PSI[ATTACH=full]320750[/ATTACH]. There are a number of powders that can generate peak pressure for most rifle cartridges, but only a certain burn rate will allow enough powder burned to achieve the gas volume necessary for peak velocities. With a larger case capacity, you can use slower burning powders that generate the same peak pressure and maintain 15K+ PSI longer. Also keep in mind that peak pressure is relative to burn rate and case capacity. Example 308W vs 300wm. If loaded to the same pressure, the 300 wm wins by a mile. Only real difference is case capacity. I'm attaching a chart which illustrates what I'm attempting to example. Compare lines 1 and 3.[ATTACH=full]320750[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Kinda torn!!! Build advice
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