And, the tangos didn't use smokeless powder. They used powder
from torn down commercial fireworks, and maybe some black powder (either
commercial or home made).
Smokeless is a poor item to use, as once a container bursts, it either
slows WAY down, or ceases burning altogether. Black and fireworks
powder burns the same rate, containment or not.
Smokeless only burns explosively contained under pressure, as in
a cartridge ignited by initial heat and pressure from a primer.
They are even talking taggants (again). Back in the 80s they were talked about
and it was concluded they would impair/change the properties of smokeless
in unpredictable ways - i.e., dangerous. Especially considering the
infinite variations of taggants needed if they were able to trace a given
pound of powder from mfr to end user. Currently taggants (or detectants)
are used in plastic explosives as far as I know.