What is this round lead looking thingy...

[olekyground]

Hey friends. Went out today for a hunt. Didn't find anything interesting accept for this odd looking thing. It looks like maybe lead? It just looked too round not to be anything. Has a metal piece that sticks out from the back. Any ideas Thanks!

 

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[SCDigginWithAK]

Almost looks like a flat button.

 

[olekyground]

Yea t does but I don't think it is. It doesn't feel right to be a button

 

[BosnMate]

Lead seal?

 

[duggap]

Maybe a spru from a hand made bullet.