Mr. George, John, Jack,
Many thanks for the help in identifying the projectile. As I stated in my original post, while the projectile I have in my collection was recovered in Vicksburg, I felt strongly from the day I recovered it to today that it was not Civil War. In fact, I've had it in my "what is it? box for the last 10-12 years. Now I can put it out on display properly identified.
jimmy