Many years ago I was metal detecting on an old farm which was in close proximity to a Civil War skirmish site. On this farm I found two relics that are unmistakably from the Civil War. One was a lead sabot from an exploded Hotchkiss shell, and the other was a lead case shot possibly from the same shell. In close proximity to these relics I also found a .36 cal fired round ball which I believe came from a colt revolver. How can I determine if this round ball was from the Civil War or from a civilian firing his gun?