Well I've done demonstrations with smokeless powder and black, ignited on a wooden board, yes the black burns a whole lot faster, BUT....,
When confined in a steel can, it is
confined. Now I don't know about the new fangled plastic containers, but in a metal can, OR made into paper cartridges inside an military ammo can...it does "pop" those containers pretty fierce....I've never done either with a full amount, it was a demonstration as to not being careless in leaving an empty metal container lying about with residual powder.
You need to also check your local laws. For example many states and some counties/cities restrict the amount of powder you may have inside your dwelling for "reloading" purposes, and by type of dwelling. So often you find that an apartment building (check your lease agreement too) has a higher restriction than a town-home, and a town-home has a higher restriction than a single family dwelling.
Have you considered one of these
"Prepper" Storage Cans if you have a house and not an apartment? They will hold five of the old style steel cans used for BP, seal well, and are outside the home.
LD