Hi All,
I'm a new guy to this place, but it sure seems like a nice forum.
As for that "bullet". Are you sure that is lead on the tip? Seems to me it would be pretty deformed.
If it is what I think it is that tip is tungsten carbide which looks like old lead when it tarnishes, except it won't oxidize to white like old lead.
What that looks like to me is the cutting tip off of a rock drill or trencher tooth. They come in all shapes and sizes but most are pretty similar in design.
Here's a link to a site that has some teeth pictured.
http://www.jpself.com/teeth.htm
Either way, it looks neat.
Y'all take care,
Willie