Is this a Percussion Cap??

[Hogtown Hunter]

Please excuse my inexperience. I found a few of these in the same area I found two musket balls. They are about 5/8" in diameter. Thanks

 

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[metrotec]

size?? most percussion caps I've found were split in several places on the sides.

 

[jewelerguy]

looks kinda sorta like the copper jacket from a modern bullet (separated from the lead core)

 

[smokeythecat]

It's not a percussion cap. They are paper thin. Your item looks a lot heavier, like a mushroomed bullet.

 

[fyrffytr1]

They might be the remains of boot lace hooks.

 

[Richard Guy]

Not a percussion cap but a keeper!