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recoil v accuracy
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<blockquote data-quote="WildRose" data-source="post: 523345" data-attributes="member: 30902"><p>Your interpretation, not my intent.</p><p> </p><p>As the volume increases the pressure drops from the initial. However. With a faster burning powder, combustion is completed very quickly. That is why we use the faster burning powders with lower volume cases, and shorter bbls with the fastest burning powders typically being used in pistol cartridges.</p><p> </p><p>With our larger caliber, higher capacity cases and heavier projectiles we utilize slower burning powders in order to spread out the total time pressue is being created through combustion.</p><p> </p><p>If all the powder is consumed inside the case/chamber, your highest velocity potential comes when the bullet separates from the case.</p><p> </p><p>What we do instead with the slower burning powders and longer barrels is to continue combustion throughout the length of the barrel, so that while the pressure gradient falls as the case/bullet separates, we have a longer burn time allowing for more total velocity.</p><p> </p><p>Same exact load fired in shorter vs longer barrels provides consistenly higher velocities for that reason. You have a longer time for burn and thus increased velocity.</p><p> </p><p>No you continue producing pressure, but the peak pressure is reached in the first milisecond. Pressure begins to drop as the volume increases, but it continues pushing longer, and producing ever greater velocity the longer that pressure is constrained in the pressure vessel of the chamber and bore. Longer burn time, more total volume of gas produced, more total velocity with lower pressures than would be produced by a faster burning powder. </p><p> </p><p> </p><p>The pressure peak, is not the end of pressure being produced.</p><p>The bullet cannot accelerate faster than the gas behind it expands. When the pressure peaks, if combustion does not contine as the volume of the cylinder increases, velosity would necessarily be retarded and the friction produced between the bullet and lans/grooves would quickly decelerate it.</p><p> </p><p>We are not acting in the absence of friction here and by necessity the friction is considerable in order to achieve the desired pressures for acceleration.</p><p> </p><p>Only through the continued release of those hot gases produced by the combustion, can the projectile contine to gain speed rather than lose it.</p><p> </p><p>One of the best reads ever on the subject.</p><p> </p><p><a href="http://www.google.com/products/catalog?rlz=1T4GGLL_enUS356US356&q=Hornady+reloading+handbook&um=1&ie=UTF-8&tbm=shop&cid=1239661761232913463&sa=X&ei=QsgWTtTSDIK5tgfaqeC8CQ&ved=0CDcQ8wIwAw" target="_blank">Hornady 99238 Handbook of Cartridge Reloading 8th Edition</a>#</p><p> </p><p>Of course I'm still working off of the 2nd edition.</p></blockquote><p></p>
[QUOTE="WildRose, post: 523345, member: 30902"] Your interpretation, not my intent. As the volume increases the pressure drops from the initial. However. With a faster burning powder, combustion is completed very quickly. That is why we use the faster burning powders with lower volume cases, and shorter bbls with the fastest burning powders typically being used in pistol cartridges. With our larger caliber, higher capacity cases and heavier projectiles we utilize slower burning powders in order to spread out the total time pressue is being created through combustion. If all the powder is consumed inside the case/chamber, your highest velocity potential comes when the bullet separates from the case. What we do instead with the slower burning powders and longer barrels is to continue combustion throughout the length of the barrel, so that while the pressure gradient falls as the case/bullet separates, we have a longer burn time allowing for more total velocity. Same exact load fired in shorter vs longer barrels provides consistenly higher velocities for that reason. You have a longer time for burn and thus increased velocity. No you continue producing pressure, but the peak pressure is reached in the first milisecond. Pressure begins to drop as the volume increases, but it continues pushing longer, and producing ever greater velocity the longer that pressure is constrained in the pressure vessel of the chamber and bore. Longer burn time, more total volume of gas produced, more total velocity with lower pressures than would be produced by a faster burning powder. The pressure peak, is not the end of pressure being produced. The bullet cannot accelerate faster than the gas behind it expands. When the pressure peaks, if combustion does not contine as the volume of the cylinder increases, velosity would necessarily be retarded and the friction produced between the bullet and lans/grooves would quickly decelerate it. We are not acting in the absence of friction here and by necessity the friction is considerable in order to achieve the desired pressures for acceleration. Only through the continued release of those hot gases produced by the combustion, can the projectile contine to gain speed rather than lose it. One of the best reads ever on the subject. [url=http://www.google.com/products/catalog?rlz=1T4GGLL_enUS356US356&q=Hornady+reloading+handbook&um=1&ie=UTF-8&tbm=shop&cid=1239661761232913463&sa=X&ei=QsgWTtTSDIK5tgfaqeC8CQ&ved=0CDcQ8wIwAw]Hornady 99238 Handbook of Cartridge Reloading 8th Edition[/url]# Of course I'm still working off of the 2nd edition. [/QUOTE]
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