What would these be used in?

[Cholla]

I received quite a few of these in a lead purchase. Before I melt them down I figured I should see if they had more value as is. .580 in diameter and they have a hollow base.

 

[Acorn Mush]

Anyone with a .58 caliber Civil War-type rifle musket would likely be interested.

 

[hawkeye2]

With the shallow grease grooves and thick skirt probably not.