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Does the Bullet's Tip Melt While Going Through the Air?

Interesting!
Are these polymer/teflon bullets designed as hunting bullets. The only teflon bullet that I know of is sold exclusively (legally) to police and military forces.
What would the brand be?
Are they sold over the counter?

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Does the Bullet's Tip Melt While Going Through the Air?

Bolth the Nosler Accubond and ballistic tip line of bullets have a polymer tip.The bullets that are designed to penetrate body armor have a polymer/teflon coating over a FMJ design bullet,a bullet with a polymer tip and a thin jacket such as these nosler bullets would not be designed to penetrate anything other than flesh and bone.

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Does the Bullet's Tip Melt While Going Through the Air?

As far as lead tip bullets melting in flight or in the barrel. The barrel would be so hot, in excess of 600 degrees, that you would not be able to touch it. Come to think of it. If the barrel was hot enough to melt the lead tip. Wouldn't the barrel expansion be great enough to prevent the bullet from being able to travel down the barrel. Possibly create enough pressure in the barrel to create some very serious damage. It could take weeks to find all of the pieces and your body parts.
The flight time would be a fraction of a second. Barely any time at all.

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Does the Bullet's Tip Melt While Going Through the Air?

At best teflon combusts at the melting point of lead (PTFE). Read the Du Pont literature for more info. At worst (non pure forms or variantants of PTFE) combust far below the melting point lead. Given that most ballistic tips are colored (ala hornady vmax) they are impure at best.

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Does the Bullet's Tip Melt While Going Through the Air?

Ive never seen one of my Noslers leave a smoke trail like a tracer round so I guess they are not getting hot enough to combust,so your research reinforces the theroy that lead tips do not get hot enough to melt.I have recovered the polymer tips from animals and they were not deformed.

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Does the Bullet's Tip Melt While Going Through the Air?

in theory they could melt, but you have to take in to account speed and time and keep in mind that the speed decreases as time increases.
as a comparison: the "SR 71 blackbird" (a fast jet) can fly at a speed of 3684 FPS at wich the fusiloge can heat up to 800 F
This would take at the very least a minute to get to that temp. a rifle bullet does not stay in flight for that long and definately does not stay at that speed for that long.
so it is feasable, but it's not going to happen

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Does the Bullet's Tip Melt While Going Through the Air?

and on that note, the heat from friction starts where the friction is and then moves to the center. the tip never touches the barrel and so the heat from the barrel moves from the edges to the center and out to the tip last. the edges of the lead core would melt first then the center right befor the tip if you wanna figure in barrel friction.
maybe if you had a 20 ft barrel,lol

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Does the Bullet's Tip Melt While Going Through the Air?

LOL that might do it!maybe we can try that with some of those "illegal" bullets,think Ill get busted if I spray a bullet with WD-40?

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Does the Bullet's Tip Melt While Going Through the Air?

So then, if a bullet's kinetic energy at least partially converts to heat, then if it were to, say, be exposed to different levels of atmospheric pressure, and consequently, air resistance, and it did so at a very high velocity, like 22 Hornet type velocity, wouldn't it be expected then that it would vaporize? That is how spaceborn projectiles meet their demise when they meet Earth's atmosphere. The debris travels at ultra-high velocity, often 30 or 40 miles per second, and when it is greeted by atmospheric pressure and air resistance, it's own kinetic energy converts to heat, and it melts or vaporizes.

Of course, no bullet is anywhere near capable of speeds like those, a bullet would need to travel at 5280 fps simply to travel at one mile per second.

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Does the Bullet's Tip Melt While Going Through the Air?
Captain_Obvious wrote:
So then, if a bullet's kinetic energy at least partially converts to heat, then if it were to, say, be exposed to different levels of atmospheric pressure, and consequently, air resistance, and it did so at a very high velocity, like 22 Hornet type velocity, wouldn't it be expected then that it would vaporize? That is how spaceborn projectiles meet their demise when they meet Earth's atmosphere. The debris travels at ultra-high velocity, often 30 or 40 miles per second, and when it is greeted by atmospheric pressure and air resistance, it's own kinetic energy converts to heat, and it melts or vaporizes.

Of course, no bullet is anywhere near capable of speeds like those, a bullet would need to travel at 5280 fps simply to travel at one mile per second.

Your right that a 22 hornet should produce sufficiant speed to melt lead by air friction, but it does not stay in the air long enouph to generate that heat and it's speed does not stay constant like a jet does. you hit it right on with the object comming in from space. the only reason they heat up or disinigrate is because in space with no friction you can reach any speed no matter the shape of the object as long as you have the perpulsion to do so. it's this potential for super speed that happens and when it hits the atmosphere it is traveling faster than a bullet and it is traveling down to earth with the force of gravity helping it retain speed for a longer time.
hmmm so maybe it is possable with the hornet as long as you fire it straight down at earth from almost space./w the nessasary oxygen to combust the powder

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