The small ones look like they'd have to be minie balls to me. I would assume that the larger one is too, but I'm not sure why there isn't a ring shape around the bottom like there is on the smaller ones. I'd generally think that they'd all have to be minie balls though. The grooves in the bottom suggest that as well. I've got no idea how old they'd be though, but I could only assume that they'd be Civil War Era.