Wow, I see so many suggestions that I just have not seen available being suggested. It has almost become a pastime between setting alerts and watching websites for in stock for well over a year now.
N140??? 4895???
I've seen Varget more than those. I don't think substitutions will get you that great temp insensitity of Varget but CFE223 is somewhat available. TAC in and out, I think in more than CFE, in quite a bit in the past 2 weeks. If you want something you can somewhat reliably buy again I found AA powders one of the most reliably available, so for 308 at that bullet weight as some others have pointed out AA2520 or AA2495.
At least that has been my experience. I hate spending time load testing and then have to start over if when I deplete inventory and that option is not available.
JB