The NY mentality, instilled by the draconian ridiculousness of the State that has brainwashed all residents that you live by permission! Tht all you do, has a Law regulating the activity!
This is not freedom... It is oppression!
And it "IS" NY... Evident by this type of question that arises, again and again...
Private sales of gunpowder have not been outlawed in NY as far as I know but hey it is the PRNY we are talking about.
Most powder storage for private citizens can be found in local fire ordnances. If you are a retailer then the ATF and the other jurisdictions which issued the explosives license have regulations to follow.