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Rifles, Reloading, Optics, Equipment
Reloading
Temp sensitivity
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<blockquote data-quote="Bart B" data-source="post: 796654" data-attributes="member: 5302"><p>How does one measure the temperature of powder inside the case with an IR thermometer?</p><p></p><p>Pointing mine at a cartridge only measures the temperature of the brass case. Cartridge brass does not have the same temperature rise coefficient as smokless powder. The heat transfer coefficient of brass is 315; copper jacket's 389. For cellulose (closest thing to smokeless powder I could find) is .039. So the case will heat up much faster than the powder.</p><p></p><p>I have observed that the longer a cartridge stays in a hot chamber, the faster the bullets leave. With a .308 Win. cartrodge, every 30 seconds of chamber time requires a 1/4 MOA reduction of sight elevation for 1000 yard targets. 30 caliber magnums need a 1/4 MOA change down after about 20 seconds.</p></blockquote><p></p>
[QUOTE="Bart B, post: 796654, member: 5302"] How does one measure the temperature of powder inside the case with an IR thermometer? Pointing mine at a cartridge only measures the temperature of the brass case. Cartridge brass does not have the same temperature rise coefficient as smokless powder. The heat transfer coefficient of brass is 315; copper jacket's 389. For cellulose (closest thing to smokeless powder I could find) is .039. So the case will heat up much faster than the powder. I have observed that the longer a cartridge stays in a hot chamber, the faster the bullets leave. With a .308 Win. cartrodge, every 30 seconds of chamber time requires a 1/4 MOA reduction of sight elevation for 1000 yard targets. 30 caliber magnums need a 1/4 MOA change down after about 20 seconds. [/QUOTE]
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Temp sensitivity
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