I think you would be screwed no matter what. If you even told the fire dept about ammunition on site, they would probably not go in.
I am still surprised at that.
I throw all my old paint cans in the bon fire. One ,for fun, but it also readies them to be flattened and go in the scrap steel.
Actually, a large old swollen can of tomatoes outdid most of the paint cans in destruction recently.