Note to self....do not use explosive paperweights.
Back when I was a kid, I knew somebody who had used an old Hotchkiss shell as a doorstop for years . . . until a visitor who happened to be a former artillery captain pointed out that the darned thing probably was live. The EOD guys from Ft. McPherson showed up and carried it away. Don't know what happened after that or if it was live. That black powder was probably pretty darned unstable after 100 years . . .