I've read something like that before. I guess what I'm asking is, is there a difference between black powder and smokeless, as far as making bombs is concerned? Why are people talking about there being a difference between BP and propellant?
I think BP goes from low gear to high gear pretty much in one step if it's contained -- doesn't take much confinement at all.
Smokeless has a lot more energy per pound that BP, and the more you confine it the faster it burns. I don't know if it's
possible to detonate with a large enough amount and sufficient containment or not; it's designed not to. (cool word of the day: phlegmatizer)
So it's
much easier to make a bomb using black powder, but the yield will be lower than a properly made device using smokeless powder.
I am not an expert on such things, just know something about it. I may be totally wrong about some of the details.