Can anyone identify this projectile?

[UptaCamp]

My FIL has some of these 7mm Rem Mag cartridges but he isn't sure what the gold/black projectile signifies; any ideas?

 

[Jack Rabbit]

Is that corrosion ?

 

[UptaCamp]

Is that corrosion ?

It does not appear to be corrosion/wear.

 

[danrum]

I wonder if the blue is some type of sealant. Just guessing however.

 

[palmettomoon]

If it was a sealant, I'd expect to see it around the primer as well. There was a period of time in the early to mid 90's (Ruby Ridge, Waco, etc.) where folks were putting up loaded ammunition and sealing the case mouths and primer pockets for long term storage. When taggants in powder and shortened primer shelf life rumors were all the rage, folks were buying components and loading their own ammunition like I've never seen. I almost got caught up in the nitwittery myself.

That is the LEAST probably explanation. I've not seen a projectile like that. It looks like it may be turned bronze? I've seen turned bronze bullets used in magnum cartridges but it's been a minute and they are expensive.

 

[JBWJr]

I've read in a few places, a long time ago, where people would use various metals turned down for bullets and would put bluing on the shoulder areas to keep down galvanic* response between it and the brass. Dunno. Maybe.


*--A galvanic reaction occurs when two dissimilar metals are in electrical/acidic/humid contact with one another which causes one metal to corrode. Noble metals (gold, silver, platinum, palladium) are resistant to corrosion and oxidation. When these metals are mated with more corrosive metals (tin), a Galvanic reaction would occur.

 

[palmettomoon]

I've read in a few places, a long time ago, where people would use various metals turned down for bullets and would put bluing on the shoulder areas to keep down galvanic* response between it and the brass. Dunno. Maybe.


*--A galvanic reaction occurs when two dissimilar metals are in electrical/acidic/humid contact with one another which causes one metal to corrode. Noble metals (gold, silver, platinum, palladium) are resistant to corrosion and oxidation. When these metals are mated with more corrosive metals (tin), a Galvanic reaction would occur.

 

[JBWJr]

Then, again, it might just be for hunting Black Tail...

 

[Asbestos]

Who cares? It looks absolutely baddass… therefore, it has to work very well

 

[Allsmiles]

I'm voting on a tweaker with a sharpie. However, JBWJr explanation seems reasonable.