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Rifles, Reloading, Optics, Equipment
Reloading
chrono speed, vs temperature
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<blockquote data-quote="Kevin Thomas" data-source="post: 555946" data-attributes="member: 15748"><p>D Scott,</p><p> </p><p>The general rule for IMR type extruded tubular single base powder is approximately 1.7 fps per degree, in the direction of the temerature. That is, temp goes up ten degrees, you can expect velocity to increase about 17 fps. Temp decreases the same amount, and you'll see the same in the other direction. For the 20 degree shift you mentioned, I wouldn't be a bit surprised to see a 34 fps switch (or thereabouts), but would be looking for another explanation for a change of 100 fps. This is a general rule, and there are some exceptions. </p><p> </p><p>Given the focus on the temperature sensitivity, this is becoming less of an issue today, but the trend remains the same.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 555946, member: 15748"] D Scott, The general rule for IMR type extruded tubular single base powder is approximately 1.7 fps per degree, in the direction of the temerature. That is, temp goes up ten degrees, you can expect velocity to increase about 17 fps. Temp decreases the same amount, and you'll see the same in the other direction. For the 20 degree shift you mentioned, I wouldn't be a bit surprised to see a 34 fps switch (or thereabouts), but would be looking for another explanation for a change of 100 fps. This is a general rule, and there are some exceptions. Given the focus on the temperature sensitivity, this is becoming less of an issue today, but the trend remains the same. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
chrono speed, vs temperature
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