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Lugging the rifles to the range I proceeded to sight-in the little guys but as I recall the attempt was pretty frustrating. Put simply no hits on the target at 50 yards, 25 yards and at this point I got really frustrated. Moving down to the pistol range I finally got hits at 15 feet. I still have the targets with full longitudinal bullet profiles. It was obvious that the high velocity 17 caliber cartridges were causing the cores to destabilize resulting in unpredictably wild fliers.
I'm not sure that the problem was destabilization of the core. I've had lead pistol bullets tumble in midair at much lower velocities, and obviously with a solid lead bullet there's no core so you can't have core destablization. I'm much more inclined to think that in that case, the bullet was simply being driven to a higher velocity than that barrel and twist rate could stabilize it.
Speaking of core stability, or lack thereof, I once asked a police sniper why I was getting consistently lousy accuracy out of M855 62-grain "Green Tip" service rounds, even in heavy-barrel rifles that shot well with other ammo. This is a guy who has done a lot of weapon and ammo testing for accuracy. He told me that the penetrator core of these bullets was not consistently centered, and the variation caused the bullet to wobble. Acceptable in a battlefield situation where you're shooting full-auto; not so great for precision shooting.
And one final note - Metal does not have to melt completely to flow under pressure. Lead is a perfect example. You can squash a lead sinker or bullet with the relatively low pressure generated by a vise, or even a pair of pliers. This may or may not be relevant to any specific situation involving bullets at high velocity, but it's something to keep in mind.
The sniper's comment was about the centering of the steel penetrator core in front of the lead slug, not the lead slug inside the jacket. The penetrator core doesn't drift off center during flight; it's not consistently centered in the first place. The latest M855A1 round doesn't use lead at all; the slug is a bismuth-tin alloy, making the new bullet somewhat longer because the alloy is less dense than lead. In any case, the previous comment referred to the old M855 cartridge. I haven't seen M855A1 ammo or bullets on the civilian market. The image below is the original M855.This is very telling indeed, because all lead cores that usually have these integrity issues,
All metals have a crystalline structure.
Dust is chunks.
The melting point of lead is around 600 °F.
Heat permeability in any metal is not high enough to transmit heat through the bullet body during the part of a second it takes the bullet to hit its target. Even less so when disintegrating mid flight.
Wound tracts are not cauterized.
Inferior jacket material does not lower the melting point of lead.
I think the OP has posted his theories & treatise on "Ammunition integrity" on the wrong forum. In all his extensive post the only time he used the word SAKO was in his greeting "Hello my fellow Sako members", except in post #15 where he made a brief reference to his Sako barrels. Not once has he mention a Sako rifle, model name, or asked a question about Sako or anything related to Sako. Then he proceeded to give his lengthy imaginings about bullet performance ad nauseam. There are forums where this subject matter can be debated that are much better suited to his crusade. This is the "Sako Collectors Club", not the bullet integrity club. I'm curious why he chose this site to espouse his theories while completely ignoring the subject of Sako rifles. I smell a troll!
The sniper's comment was about the centering of the steel penetrator core in front of the lead slug, not the lead slug inside the jacket. The penetrator core doesn't drift off center during flight; it's not consistently centered in the first place. The latest M855A1 round doesn't use lead at all; the slug is a bismuth-tin alloy, making the new bullet somewhat longer because the alloy is less dense than lead. In any case, the previous comment referred to the old M855 cartridge. I haven't seen M855A1 ammo or bullets on the civilian market. The image below is the original M855.
View attachment 23001
When you assume you make an ass out of you and me.Well your assumptions on based on atmospheric pressures near sea level. Like I've stated before, lead doesn't need to reach 600F in a vacuum situation, or even in a near vacuum situation to flow. What you are saying is correct, but only if considering normal atmospheric conditions. Water will boil under a vacuum and then will actually start to freeze, so we must take into account that materials start acting very much different under certain pressures than it usually does at normal atmospheric conditions. Although I do understand what you mean as far as heat signatures, and maybe looking for cauterizing flesh to confirm a heat issue. Although what we're discussing is actually quite different and is happening under very extreme conditions and happening very fast and changing very fast.
When you assume you make an ass out of you and me.
I do not assume.
You are mixing temperature and preassure.
Boiling is a non specific term describing a process where by water turns from one aggregate state to another due to increased energy level.
"Boiling" in vacuum is due to dispersion of water molecules in said absence of matter.
Water vapour does not turn solid in vacuum above its melting point.
You are really just hypothesizing and you are way off...
Please!!!I guess we'll just end this back and forth here.
My two cents worth. Up until now the only time I confirmed that the lead core was melting was when I goy my first 17 rifle. Actually I should say two of them. The first was a Rem 700 BD in 17 Rem and the second being a H&R Ultra wildcat in 17-223. I still have both by the way. All of this said back in the day I handloaded using Hornady 25 gr HP pills.
Lugging the rifles to the range I proceeded to sight-in the little guys but as I recall the attempt was pretty frustrating. Put simply no hits on the target at 50 yards, 25 yards and at this point I got really frustrated. Moving down to the pistol range I finally got hits at 15 feet. I still have the targets with full longitudinal bullet profiles. It was obvious that the high velocity 17 caliber cartridges were causing the cores to destabilize resulting in unpredictably wild fliers.
The solution came with the Remington 25 gr core lokt 17 caliber bullets. I recall that I had to buy a very large quantity of them to get Remington to sell the little buggers to me. I still have a bunch of them but I can tell you that hitting a fly on the target at 100 yards was something that I could do consistently.
rick
If a 25 g , . 17 caliber bullet with a jacket of copper with a thickness of say... .005”s, is pushed through a barrel with rifling that is .002” high. It will only leave approximately.003” +- of jacket material after it leaves the muzzle. Those grooves, in the jacket being thinner now are a weak point at each location around the entire circumference of the bullet. With Velocity reaching towards or past the 5000 FPS mark and the physical properties involved with aerodynamics and two different soft metals wrapped around each other, with the jacket now being compromised with grooves that thin it in multiple striations in its circumference, something has to give as those limitations are exceeded. The bullet, simply put is overwhelmed by the laws of physics.
Hippie