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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
is copper jacket spinning around lead core during flight
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<blockquote data-quote="Professor Doolittle" data-source="post: 2276655" data-attributes="member: 118902"><p>I agree its the boundary between the copper and lead that is most likely to either melt or become extremely soft, enough to not hold against high moment of inertia, or competing moments of inertia, one lead and one copper. Now the copper is an excellent thermal conductor for the same reason its an excellent electrical conductor, it freely releases its surface electrons which carry thermal energy. That's why the copper feels colder than the brass or steel. The high heat in the casing as it starts to push the bullet is instantly transferred through the copper into the lead. Unless the lead is an alloy I find it hard to believe it won't melt or at least become very soft at least at the tail end. I think what you're saying is the tail end might melt but that doesn't mean the whole core melts enough to spin free of the jacket. Sound's plausible. If it does spin free it must have a destabilizing effect if it syncs up again in flight.</p></blockquote><p></p>
[QUOTE="Professor Doolittle, post: 2276655, member: 118902"] I agree its the boundary between the copper and lead that is most likely to either melt or become extremely soft, enough to not hold against high moment of inertia, or competing moments of inertia, one lead and one copper. Now the copper is an excellent thermal conductor for the same reason its an excellent electrical conductor, it freely releases its surface electrons which carry thermal energy. That's why the copper feels colder than the brass or steel. The high heat in the casing as it starts to push the bullet is instantly transferred through the copper into the lead. Unless the lead is an alloy I find it hard to believe it won't melt or at least become very soft at least at the tail end. I think what you're saying is the tail end might melt but that doesn't mean the whole core melts enough to spin free of the jacket. Sound's plausible. If it does spin free it must have a destabilizing effect if it syncs up again in flight. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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is copper jacket spinning around lead core during flight
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