Black powder really worked well in the exploding mortar and artillary shells at Vicksburg. I believe black powder would work extremly well in a “pressure cooker bomb”. When I first saw the explosion I thought it mat be a black powder bomb. Now the’re probably going to come for my Pyrodex.
I have seen photographs of the components which were recovered and none of them hhave any of the tell tales of black powder. Not sure what it was but it was not bp.