Smokeless is pretty safe. It can be made into a bomb using a piece of pipe and cape on each end. Otherwise it just burns rapidly.
Not as dangerous as all the aerosol bottles in your home.
Black powder will explode but is not a powerful explosive like TNT.
Black Powder’s RE factor is .55 compared to TNT’s RE of 1.00
The relative effectiveness factor, or R.E. factor, relates an explosive's demolition power to that of TNT
A lot of blasting has been done with black powder.
Unless the bullet is in the chamber of a gun. The potential for being”shot” is pretty low.
I reload. I like to buy most of my powders in 5lb containers to save money. It is amazing how many people get completely freaked out when they see a few 5 pound containers of powder sitting around.
Storing gasoline inside is much more dangerous because the vapors are heavier than air under most conditions and can travel to an ignition source and the flames can travel back to the container. Propane vapor is also heavier than air and has a very wide flammability range, so it is also more dangerous to store inside. Propane containers BLEVE when they are inside a burning building.
During my career I went to several fires where propane tanks from barbecues exploded while we were fighting a house fire. Each time we were very thankful that we were far enough away that no one got hurt.