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Old April 10, 2005, 10:49 PM   #1
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weight the same, power loads different.

if you have a 230 grain bullet 1 lead, one jacketed ,why does it take more power to expel the jacketed bullet over the lead bullet according to the powder manufacturer's specifications?
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Old April 10, 2005, 11:00 PM   #2
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lead vs copper

copper is harder thus it resist being transformed to match the grooves and barrel diameter. It takes more energy to push it down the barrel. with the same powder charge it will develop more pressure due to this effect and be slower comming out.
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Old April 11, 2005, 01:23 AM   #3
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It's all about FRICTION! Lead bullets are softer than copper, regardless of how hard you cast them - even straight linotype. The softer the projectile, the less friction it produces because it shapes itself to the bore and rifling faster which creates less heat which creates less friction. Although jacketed bullets can be pushed to higher speeds - at higher pressures - due to the protection of the harder copper coating, cast bullets can be launched at near magnum speeds using a crimped on metal base cap and still create lower pressure.
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