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Rifles, Reloading, Optics, Equipment
Reloading
Efficiency question about guns....
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<blockquote data-quote="J E Custom" data-source="post: 1053016" data-attributes="member: 2736"><p>Efficiency is relative to many things. When comparing one cartridge to another everything comes </p><p>into play. Barrel quality, chamber quality, barrel length, powder burn rate, primers ability to set off the particular powder. bullet weight, twist rate and most of all Pressure produced by the load combination and the volume of gas used to do so.</p><p></p><p>Smaller cartridges burn less fast burning powder to get the same velocity than a large cartridge</p><p>that uses more slow burning powder reaching the same pressure.</p><p></p><p>So the answer to your question is simple, the larger the cartridge the less efficient per grain</p><p>of powder it will be. If it uses the best powder for velocity at the same pressure for the volume of the case. PO Ackley called the point where a cartridge gained less velocity per grain of powder "Over Bore"</p><p></p><p>All cartridges reach a point of diminishing returns where the gain in velocity is not the same per grain of powder. In fact I have seen cartridges slow down when the wrong powder or more powder was used.</p><p></p><p>Velocity comes at a price, More velocity, requires more powder, and in order to get this with all other things being equal, more case capacity is required.</p><p></p><p>Physicist would simply say it is a mater of time and pressure. (Time in the barrel and peak pressure).</p><p></p><p>Longer barrels produce more velocity to a point and then they reach there practical limit.</p><p></p><p>Comparing one cartridge to another, is as said "APPLES AND ORANGES" </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1053016, member: 2736"] Efficiency is relative to many things. When comparing one cartridge to another everything comes into play. Barrel quality, chamber quality, barrel length, powder burn rate, primers ability to set off the particular powder. bullet weight, twist rate and most of all Pressure produced by the load combination and the volume of gas used to do so. Smaller cartridges burn less fast burning powder to get the same velocity than a large cartridge that uses more slow burning powder reaching the same pressure. So the answer to your question is simple, the larger the cartridge the less efficient per grain of powder it will be. If it uses the best powder for velocity at the same pressure for the volume of the case. PO Ackley called the point where a cartridge gained less velocity per grain of powder "Over Bore" All cartridges reach a point of diminishing returns where the gain in velocity is not the same per grain of powder. In fact I have seen cartridges slow down when the wrong powder or more powder was used. Velocity comes at a price, More velocity, requires more powder, and in order to get this with all other things being equal, more case capacity is required. Physicist would simply say it is a mater of time and pressure. (Time in the barrel and peak pressure). Longer barrels produce more velocity to a point and then they reach there practical limit. Comparing one cartridge to another, is as said "APPLES AND ORANGES" J E CUSTOM [/QUOTE]
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Efficiency question about guns....
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