Due to some comments on another forum, I did some research on Alliant. It appears many if not all their powders were being made at the Radford Arsenal in rural, VA. I had been told there was only one powder making plant in US and that was in FL. Apparently, not so. The plant at Radford Arsenal makes as many as 25 to 30 different propellants / explosives. Alliant took over from Hercules about 25 to 30 years ago, but Alliant lost out to a different government weapons contractor around 2012. Alliant was then forced to either buy from them, or contract with them to continue making the canister reloading powders we know as Alliant. Red Dot, Green Dot, Unique, Bullseye, etc. Apparently their supplier cut them off to focus on military explosives. The limiting component appears to be nitrocellulose. Radford plant is only plant in north America that makes it.
Hopefully the fracas in Gaza and the other one in Ukraine both come to an end soon, supplies catch up and at some point, production of Alliant powders resumes. What is encouraging are reports it was not a choice made by Alliant. It was forced upon them.