Looks like Army-model Parrott sabots. To be any more specific than that, I need diameter measurement of the iron body and the brass ring (the one that's not bent out of shape). Also need a "sideview" photo to confirm the Army-model ID. If they were fired from a US Navy gunboat in Louisiana, they are probably 4.2-inch caliber, also called "Thirty Pounder" caliber.
The "about .69-caliber" lead balls are case-shot (antipersonnel) balls from the exploded shells. The larger lead balls are from US Navy Canister-ammo.