Best powder for Grendel

[Lazermule]

I am starting out with 123 grn Hdy SST and ELDM in this 12" AR. I do have a lot of Varget as I load it quite often in other rifles with great results. I'm sure this is a different animal certainly with this shorter barrel, but I'd like to find success with Varget. I loaded up some 123 grn SST's with some TAC yesterday and I should be able to test them in the next week so we'll see if that is a winner or not. I'll probably run some Varget loads as well to see how it works. I'll have to see what else I have, I don't think I have any 8208 or CFE.

LM