I dunno, Cadet, the few BP rounds that I've touched off seemed to have plenty of whollop .. from a percieved recoil perspective it could be argued that BP has more verasity than smokeless for a similar DE loading.
nothing to do with pressure nor velocity here, only perception, thank you ;-)I am aware of the refs to dif woods for charcoal producing better [stronger?] BP
Also on the DE question, they only had ballistic pendulums for instruments until well after the invention of smokeless, so that any DE ref of old was ball park only, but was within the realm of closeness to said DE velocity. If I am not mistaken, there were no pressures involved in any DE specs, only velocity.