✅ SOLVED Anyone have a clue on this little copper "plug?"

[Subterranean]

It was found in a wooded, mountaintop hayfield that was extensively hunted over the past two centuries. It appears to be made of copper and was once round. The indentation in the middle is not through and through. It looks more like a plug with grabbing "fingers" made to sink into leather or wood, maybe? Note the rope braid design of the rim around the outer edge of the hole. Any possible answers to the riddle are appreciated. Thanks, Happy Hunting, Sub

 

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[Silver Searcher]

Looks like a Hilti Cartridge....

SS

 

[releventchair]

Copper jacket off bullet. lead is missing. This one recovered from a deer performed in same manner during its upset.

 

[kuger]

def. a bullet.......Relevant is likely spot on

 

[Subterranean]

Thanks guys, but I am perplexed by the symmetrical "rope braid" rim around the edge of the hole. Where on a modern bullet would that come from? And prior to being buried for years, the "fingers" appeared to have been all the same size and pattern, bent inward. Weird...I appreciate all the help! Sub

 

[releventchair]

Look up reloading supplies,bullets. On unseated bullets you,ll find your "rope" answer,(cannelure) which due to seating depth and crimp is not visible in most loaded rounds..Bear in mind your pic is the inside of jacket now outside. Look up fired bullets too if you please.Remington core lokt a good example.

http://ts1.mm.bing.net/th?id=H.4816046644923008&pid=1.7&w=264&h=188&c=7&rs=1

 

[TheCannonballGuy]

Releventchair is spot-on in BOTH his posts. (Great explanation in the second one, by the way.) Here are photos showing a copper-jacketed bullet's "reeded cannelure", which produces your jacket's "rope braid" when the jacket is turned inside-out. You'll have to use TreasureNet's option to supersize the image to see the equidistant slits around the jacket's opening (at its top), which produce the "fingers" you mentioned when the jacket is expanded.

For anybody who doesn't already know:
The term reeded cannelure means the bullet's body-groove (which in the modern era is called a cannelure) has multiple tiny short parallel lines inside the groove. They are clearly visible in the photo of the lead bullet.

 

[Subterranean]

Thank you all very much guys, I learned something here. I will mark it as "solved," and wish you all Happy Hunting! Sub