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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="del2les" data-source="post: 2277736" data-attributes="member: 9299"><p>As an longtime bullet swager and past licensed ammo maker, the lead "core" does not melt, and if the lead core has been swaged properly in an appropriate thickness jacket, usually, it will not separate in flight. Some Thin jacketed varmint bullets may and have jacket separation in flight due to high centrifugal forces, rifling engraving, rough bores, etc, but usually, this warning will be applied by the manufacturer to not use beyond a certain twist rate and/or velocity. This has nothing to do with the actual core/jacket bond or a core melting.</p><p></p><p>In flight projectile heating is real, but there have been no known or observed instances of that temperature reaching the point of melting the lead core. Having tested and observed numerous projectiles after being fired into water, gel and other traps, we have never seen any indications of core melting. At longer ranges and via radar BC testing, there have been some indicators that a plastic or lead "tip" may actually deform from resistance and heat and reduce the original BC of the projectile, and this was the reason behind Hornady's change from AMAX tip to the ELD tip.</p><p></p><p>During the lead core swaging process, the pressures applied to the core enlarges the core and jacket until it matches the ID size of the die, and once pressure is removed, the jacket ever slightly springs back giving an extremely tight grasp on the core material. Only a poorly swaged bullet will allow for any slippage between the two materials within modern shooting velocities and twist rates.</p><p></p><p>While I understand one's reasoning behind the question, it isn't anything to worry about.</p><p></p><p>As an FYI, I have swaged very light for caliber bullets and fired them at 5,250fps, and I have never experienced separation nor indications of melting.</p></blockquote><p></p>
[QUOTE="del2les, post: 2277736, member: 9299"] As an longtime bullet swager and past licensed ammo maker, the lead "core" does not melt, and if the lead core has been swaged properly in an appropriate thickness jacket, usually, it will not separate in flight. Some Thin jacketed varmint bullets may and have jacket separation in flight due to high centrifugal forces, rifling engraving, rough bores, etc, but usually, this warning will be applied by the manufacturer to not use beyond a certain twist rate and/or velocity. This has nothing to do with the actual core/jacket bond or a core melting. In flight projectile heating is real, but there have been no known or observed instances of that temperature reaching the point of melting the lead core. Having tested and observed numerous projectiles after being fired into water, gel and other traps, we have never seen any indications of core melting. At longer ranges and via radar BC testing, there have been some indicators that a plastic or lead "tip" may actually deform from resistance and heat and reduce the original BC of the projectile, and this was the reason behind Hornady's change from AMAX tip to the ELD tip. During the lead core swaging process, the pressures applied to the core enlarges the core and jacket until it matches the ID size of the die, and once pressure is removed, the jacket ever slightly springs back giving an extremely tight grasp on the core material. Only a poorly swaged bullet will allow for any slippage between the two materials within modern shooting velocities and twist rates. While I understand one's reasoning behind the question, it isn't anything to worry about. As an FYI, I have swaged very light for caliber bullets and fired them at 5,250fps, and I have never experienced separation nor indications of melting. [/QUOTE]
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is copper jacket spinning around lead core during flight
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