Civil War relic collector hurt in shell explosion | ajc.com
If you like to poke around and look for old stuff, don't assume anything weapon-like is spent. The collector in question had lots of experience handling old munitions and still managed to blow himself up.
Of course, poking around and looking for old stuff should be left to the experts if you run across what seems like a substantial stash of old stuff. Location, context, layering, position are all important aspects of an artifact's history.