is copper jacket spinning around lead core during flight

[MagnumManiac]

Time has everything to do with heating something.
As I said early in the piece, lead does not melt inside the jacket, there simply isn't enough time for the heat to do so.
Look at it like passing your hand through a blow torch flame, do it quickly and you do not get burnt, hold it there….and well.
Lead cores are lubed, cores can slip, this is known. Jackets are thicker than .004", most grooves are this deep, if you section a bullet that has been fired, the rifling is not evident on the inside of the jacket, it doesn't displace enough material.
If you have ever used a roller to put cannelures on bullets, you will know just how much displacement is required to make the groove deep enough, it is on the order of .050-.060" deep and locks the core in place 90% of the time.
Anyway, bullets get hot, but not enough to melt the core while travelling down the barrel or through the air. They get far hotter after expanding in a medium, no matter what that medium is.

Cheers.

 

[DMM9623]

I just registered to ask if anyone's interested in reviving the discussion on spinning bullets and molten lead. If so I have some interesting info and photos to share that will show the end result of molten lead cores but will also spark more questions and discussion.

 

[cohunt]

Post your pics

 

[Bob Wright]

So basically I think it's all solid just due to barrel time and time of flight. This is not a returning space capsule at 25,000 mph for 5 minutes . Exposure to all the heating is way too short to liquefy the core or jacket.

 

[Brathany]

So, you chose to necromance this egg headed, mental masterbation about a contrived phenomenon that nobody has witness about lead core bullets in flight?

 

[Lenny Foffa]

So way back in 1979/1980 I was hand loading my new Weatherby Mark V rifle in 270 Weatherby Mag. With no guidance, I started to load the 130 Grn. Sierra GK faster and faster, My ridiculous thought back then was that faster must be better for killing Mule deer. So, I pushed the limits and tried for 3500 fps. I do not think I ever achieved that velocity , but on the way to that number, I noticed lots of Grey Lead Splatter on the paper targets at 100 yards. I backed off the powder charge at once, and the splatter went away. I always wondered if the lead melted inside the copper jacket, and was still liquid at 100 yards. I never thought about the jacket spinning around a molten lead core. I never did that again, I learned "Just because you can, that does mean you should."