Question about a .50 cal bullet found

If you're referring to the .50 cartridge, and not the black powder round, they are lead core with copper jacket. Specilized anti-vehicle and incendiary rounds are also encased in copper.
 

There is one AP .50 round that has a black tip and is steel core with copper jacket. Then there are the red tips which are tracers. Glows when it goes out has a copper jacket. Then there is a slap round which explodes on contact. Then there is a rolf round that explodes and penetrates on contact and comes out the other side like a shotgun blast.
 

You are most likely looking at the copper jacket on the outside of the bullet. I found the following reference page on .50 BMG ammo: Caliber .50 Cartridges
 

why i am asking, I served in the military and have a couple .50 cal rounds, neutralized of course, which are jacketed. this bullet i recovered metal detecting I have cleaned up and can only get a brass colored reflection. I believe it may have been an uncle's of mine. WWII or Korea I think he served in both.
 

And as I said it is the PROJECTILE I am referring to
 

2013-04-15 11.43.09.jpg How about this, a pic. I hope you can make out the difference in color.
 

There is one AP .50 round that has a black tip and is steel core with copper jacket. Then there are the red tips which are tracers. Glows when it goes out has a copper jacket. Then there is a slap round which explodes on contact. Then there is a rolf round that explodes and penetrates on contact and comes out the other side like a shotgun blast.
Dixie, it is clear you have an interest in ammunition that goes beyond the interest of most gals. Bravo! One thing, though (not to be critical, but to clarify) tracers do not "glow", the back of the round actually burns. It has a "cup" back there filled with a compound that burns.... possibly magnesium based. Go, girl, go! TTC
 

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