Cross section of an American Civil War-era case shot ammunition.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...y_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ll_cutaway.jpg
Previously:
https://www.homemadetools.net/forum/...361#post165954
https://www.homemadetools.net/forum/...411#post158399
https://www.homemadetools.net/forum/...077#post172170
