I knew a man, a national Germanicon, that was 16 years old at war's end. One of the stories he told me was of he and his friends going through the fields near his home(I forget where) and the mass of STUFF that was lying about. Everything. These boys took ammo and removed propellant and put it in a 45 gal drum until it was full. They then rolled it down into the stream and lit the upper end hole in the barrel. He said it whistled like a siren for a few seconds and then went off like a bomb. I wonder if that's what happened to the contents of these rounds? Something similar.