Would black powder be as powerful as the gun powder in the fireworks?
Fireworks powder is basically black powder. It is designed to go boom all at once and therefore is best suited for bombs. Modern gunpowder explodes in a more controlled fashion, in addition to being smokeless, and is much more tunable for sending a bullet down the barrel.
“Would black powder be as powerful as the gun powder in the fireworks?”
The fireworks powder would be slower and would be less suitable than real black powder. I think he just shot this stuff off as the explosive used in the bombs was high speed explosive. They apparently had access to military grade explosives and used them against the police.
Black powder is a low speed explosive and most people over rate the power of it. In the breech of a gun it works fine but in a bomb is not nearly as effective as military grade stuff.