If the powder had to be 'stabilised' that would suggest it was firework meal powder and not corned so the ingredients would separate in transit. Gun powder is a mechanical mixture not a compound. That would involve the powder being removed from the keg and remixed. Probably by hand. There would no reason to mix any other (i.e. flour) into the gun powder. Occasionally sawdust used to be mixed in for blasting purposes to slow the production of gasses to give a longer 'heave' rather than sharp cracking effect but that is irrelevant to firearms use.
Gun powder manufacturers will only make firearms good quality powder if there is a regular demand. If Mexico had only a small hunting firearms use the only other demand could come from the military. Otherwise that small demand would be best met by import. If the military are not demanding good powder from ignorance, lassitude or outright corruption (buying cheap powder and pocketing the difference from good) and there is no state manufacturer that can be directed, then industry will only make powder they can sell and firework powder needs far less capital to set up and is far cheaper to run.
The fault comes down to Mexican government and military culture of the time which itself is a manifestation of Mexican period culture and it's preceding history.
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