Davers was operating under the same misconception I was, that the last pic was a round ball instead of just the top view of the same bullet. I won't say it's from the Civil War, but it's most likely cw-era into the early part of the cartridge period. Old bullet in any event, and a good find.
As an aside, a cheap digital micrometer will aid in identifying some of your finds, particularly bullets. Dimensions down to 3 decimal places can make a big difference in figuring out what you have.