A number of shot shell powders work well in pistol loads. Blue dot and green dot were viable .45ACP propellants in the early eighties. Just about anything available can be made to work with testing. Rifle powder burns too slowly for really good pistol results, but in a pinch, if it makes the thing go bang (as opposed to boom), then......
Primers can be had, they are just VERY scarce.
youtube had some interesting sources for lead....
Cases, hold what you have, and get in good with a local range. There are still folks out there who are not policing their brass!
Good hunting.
KYPD
I had to go the other way... I was using Unique in 20 gauge and had to switch over to International Clays.
The prepared reloader is able to shoot all he/she wants..
I started this recent panic with about 40,000 primers. I’m down to about 15K now, having sold the rest at a premium to those who don’t think to plan ahead.
Powder-wise, I’m good through the end of this decade, I think and I have enough bullets to last a few years. I have 500 lbs of lead in 1lb ingots and bullet molds for my favorite calibers and a nice little electric smelter.