Great, informative answer - thanks! I'm going to do a follow-up post on this location (Scottsville, VA) later tonight or tomorrow. Several more relics I found in the same spot (winding stream between two steep hills, pits, camp) this past weekend seems to have the makings of a pretty interesting story and battle (given the bullet?), but I'd need an expert opinion. Other items found include deep railroad ties, lots of tin with bullet holes (e.g. big oil can), etc. Pretty sure the spot has been detected before, but still a really cool place to find stuff left behind or pushed up by a storm.