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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What makes a cartridge accurate?
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<blockquote data-quote="elkaholic" data-source="post: 1110767" data-attributes="member: 13833"><p>I do not have any true formulas, etc., which determine flame point impact on throat erosion, but have had it explained to me this way: If you use a cutting torch as an example, when you adjust the flame point using the oxygen, the hottest point is right at the tip of that convergence. The shoulder angle of the case theoretically "funnels" the hottest gases to a point where this angle converges as well. If you imagine lines drawn directly down this angle, the sharper the shoulder, and the longer the neck, the farther back inside the case mouth this flame point is. This has seemed to bear out in the 6.5 Sherman so far. An example of a case that has a short neck with less than the Sherman shoulder angle is the 6.5/284 which is not known for good barrel life even though it has considerably less capacity than the sherman.</p><p>There are powders that burn at different temps and it is widely accepted that pressure is also a factor. Whether or not these variables affect the location of the flame point, I do not know? This topic would make a great research project for someone with the equipment and know how to do it. I would think that the military would have data concerning this?.....Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1110767, member: 13833"] I do not have any true formulas, etc., which determine flame point impact on throat erosion, but have had it explained to me this way: If you use a cutting torch as an example, when you adjust the flame point using the oxygen, the hottest point is right at the tip of that convergence. The shoulder angle of the case theoretically "funnels" the hottest gases to a point where this angle converges as well. If you imagine lines drawn directly down this angle, the sharper the shoulder, and the longer the neck, the farther back inside the case mouth this flame point is. This has seemed to bear out in the 6.5 Sherman so far. An example of a case that has a short neck with less than the Sherman shoulder angle is the 6.5/284 which is not known for good barrel life even though it has considerably less capacity than the sherman. There are powders that burn at different temps and it is widely accepted that pressure is also a factor. Whether or not these variables affect the location of the flame point, I do not know? This topic would make a great research project for someone with the equipment and know how to do it. I would think that the military would have data concerning this?.....Rich [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
What makes a cartridge accurate?
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