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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet temp in flight
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<blockquote data-quote="Doom2" data-source="post: 2646388" data-attributes="member: 108323"><p>The SR-71 did not achieve Mach 3 until at high altitudes where the ambient temperature is much lower than 70F. In addition the SR-71 had fluid cooling of the surfaces using its jet fuel. </p><p></p><p>As to the recovered bullet it is heaviest part of the bullet and heat is transferred from the tip to the body via conduction. Unlike a metal with a fairly high heat transfer coefficient the plastic tip does not transfer heat nearly as fast from it's surface. You do not know how long that bullet flew and was exposed to the higher temperature. </p><p></p><p>As to whether Hornady actually saw an issue or not I do not know. I do know that the potential exists for this to happen with low temperature polymer.</p></blockquote><p></p>
[QUOTE="Doom2, post: 2646388, member: 108323"] The SR-71 did not achieve Mach 3 until at high altitudes where the ambient temperature is much lower than 70F. In addition the SR-71 had fluid cooling of the surfaces using its jet fuel. As to the recovered bullet it is heaviest part of the bullet and heat is transferred from the tip to the body via conduction. Unlike a metal with a fairly high heat transfer coefficient the plastic tip does not transfer heat nearly as fast from it's surface. You do not know how long that bullet flew and was exposed to the higher temperature. As to whether Hornady actually saw an issue or not I do not know. I do know that the potential exists for this to happen with low temperature polymer. [/QUOTE]
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Bullet temp in flight
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