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Originally Posted by CS86
when you start putting alloys together that some alloys will eventually seep out towards the outer surface of the bullet changing hardness characteristics. I also thought that depending on the lube that time can also change characteristics, or start to get stinky.
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The metals alloyed to lead become part of the crystalline lattice of the alloy - they can't seep out because they're electrostatically bound together. Oxidization can cause the metals to separate, but that only happens when the alloy is in a liquid state. As a solid, lead and lead alloys are stable, although the solid metal may form a thin oxide shell in a humid environment.
It's a long-winded way of saying that the alloy structure will remain stable for a long, long time.
As far as stinky lube, well, that's in the eye...er, nose of the beholder. I suppose that natural lubes could get rancid.