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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What causes powder temp sensitivity?
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<blockquote data-quote="ShtrRdy" data-source="post: 1854770" data-attributes="member: 40852"><p>Several years ago I was using the Magnetospeed to measure velocity on some cartridges I had loaded and characterized in the summer. I wanted to get an idea of what the velocity would be when it was cold. The outside temp was in the single digits (farenheit) . The velocity I measured was faster than what I measured in the summer! I wrote to Magnetospeed and their answer was that this sort of behavior is well understood, blah, blah. End of discussion, as far as they were concerned. The only thing I could think of later on was that the barrel bore was a smaller diameter which would cause higher pressure and, therefore, higher velocity. Unfortunately, on that cold day, I only fired a few rounds. If I would have fired more to heat up the barrel I might have known if that was the case. Now I only use the Mag-speed when the temp is 32 degrees F or above.</p></blockquote><p></p>
[QUOTE="ShtrRdy, post: 1854770, member: 40852"] Several years ago I was using the Magnetospeed to measure velocity on some cartridges I had loaded and characterized in the summer. I wanted to get an idea of what the velocity would be when it was cold. The outside temp was in the single digits (farenheit) . The velocity I measured was faster than what I measured in the summer! I wrote to Magnetospeed and their answer was that this sort of behavior is well understood, blah, blah. End of discussion, as far as they were concerned. The only thing I could think of later on was that the barrel bore was a smaller diameter which would cause higher pressure and, therefore, higher velocity. Unfortunately, on that cold day, I only fired a few rounds. If I would have fired more to heat up the barrel I might have known if that was the case. Now I only use the Mag-speed when the temp is 32 degrees F or above. [/QUOTE]
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What causes powder temp sensitivity?
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