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Rifles, Reloading, Optics, Equipment
Reloading
powder temperature sensitivity
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<blockquote data-quote="LouBoyd" data-source="post: 632749" data-attributes="member: 9253"><p>Knowing temperature coefficients for various powders isn't easy to translate into actual velocities versus temperature, but it's pretty easy to bring two small ice chests and a thermometer to the range with hot and cold water in them. When you're working up loads and have one you like you can test them by putting them in a small ziplock in the bath long enough for them to come to the water temperature (about 15 minutes). Then shoot them immediately over a chronograph and record the velocty and water temperature. It's the powder temperature at the time of ignition that matters most though the chamber and barrel temperature have some effect. Of course the air temperature also affects air density which determines the trajectory. </p><p></p><p>Some ballistic computers allow you to enter velocity and temperature points and they're automatically measure the temperature and proved the corrected velocity and trajectory solution. </p><p>They assume though that the ammo is at ambient temperature which may not be the case. </p><p>The Kestrel 4200 with Horus Atrag software has the capability.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 632749, member: 9253"] Knowing temperature coefficients for various powders isn't easy to translate into actual velocities versus temperature, but it's pretty easy to bring two small ice chests and a thermometer to the range with hot and cold water in them. When you're working up loads and have one you like you can test them by putting them in a small ziplock in the bath long enough for them to come to the water temperature (about 15 minutes). Then shoot them immediately over a chronograph and record the velocty and water temperature. It's the powder temperature at the time of ignition that matters most though the chamber and barrel temperature have some effect. Of course the air temperature also affects air density which determines the trajectory. Some ballistic computers allow you to enter velocity and temperature points and they're automatically measure the temperature and proved the corrected velocity and trajectory solution. They assume though that the ammo is at ambient temperature which may not be the case. The Kestrel 4200 with Horus Atrag software has the capability. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
powder temperature sensitivity
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