We are not talking about eardrum or two. I read of at least two death cases back in the early 20th century, and dozens of accidents. This have been phased out for a reason.
Now, how about used granulated black powder? It does the burst job beautifully for large shells, and a reasonable job for smaller ones. H3 is easy to get and break small shells better then most commercial items today. Why oh why do you have to use dangerous composition like yellow powder?
Answer this: 1) Do you know the temperature area where the mixture bound?
2) Do you have the ability of maintaining that range of temperature for x amount of minutes with little fluctuations?
3) Do you have unmanned mixing capabilities?
4) Do you have a blast screen?
5) Are you capable of using the mixture in a safe manner?
I assume that if you can’t invest in perchlorate or aluminium then you probably don’t invest in proper facilities as well.
I had access to all of the above and I didn’t go near this formulation. You think you know better? Be my guest