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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Your input desired on design of barrel friction experiment with bullet coatings
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<blockquote data-quote="Michael Courtney" data-source="post: 565813" data-attributes="member: 28191"><p>Our review has revealed that most of the "results" are qualitative and anecdotal, along the lines of "the coating caused the barrel friction to be reduced which caused a reduction in muzzle velocity. I was able to increase the powder charge to return to the same muzzle velocity with no signs of excessive pressure."</p><p></p><p>Please enlighten us by providing citations or web links if solid studies quantifying the friction reducing properties of the common coatings has already been done. </p><p></p><p>Careful, quantitative studies often solve problems and open doors to possibilities that anecdotal and qualitative studies had missed. </p><p></p><p></p><p></p><p>Did you miss the Norma study showing that moly coated bullets lead to increased barrel life at the same muzzle velocity? There's a difference between the real loss of barrel life that occurs going from a standard to a magnum cartridge and the theoretical loss of barrel life that might result from adding a few grains of a faster powder to gain some velocity in the same cartridge. You also seem to assume that only the powder and not the barrel friction contribute to barrel heating. The added erosion and heating from the extra powder may well be offset by the reduced erosion and heating from a significant reduction in barrel friction.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 565813, member: 28191"] Our review has revealed that most of the "results" are qualitative and anecdotal, along the lines of "the coating caused the barrel friction to be reduced which caused a reduction in muzzle velocity. I was able to increase the powder charge to return to the same muzzle velocity with no signs of excessive pressure." Please enlighten us by providing citations or web links if solid studies quantifying the friction reducing properties of the common coatings has already been done. Careful, quantitative studies often solve problems and open doors to possibilities that anecdotal and qualitative studies had missed. Did you miss the Norma study showing that moly coated bullets lead to increased barrel life at the same muzzle velocity? There's a difference between the real loss of barrel life that occurs going from a standard to a magnum cartridge and the theoretical loss of barrel life that might result from adding a few grains of a faster powder to gain some velocity in the same cartridge. You also seem to assume that only the powder and not the barrel friction contribute to barrel heating. The added erosion and heating from the extra powder may well be offset by the reduced erosion and heating from a significant reduction in barrel friction. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Your input desired on design of barrel friction experiment with bullet coatings
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