Given the current situation I think Ramshot would be a easy alternative. I'm not positive, but I think anyone with an FFL canorder from Western Powders.
I've tried Zip in 45acp and it did everyting I asked it to, and it was available during the last crunch.
I have a freind who really likes it, Tac in .223. I think Hunter in a .260 AR platform, and others.
There's a disturbing trend of people just jumping on some cult following of certain powders, just picking one and asking on these forums for loads without really trying anything else, like Varget, H4350, H1000, etc....
Not saying those powders are bad by any means, far from it, just saying people aren't exploring any other options, creating the mess we see today.