I'm getting ready to reload a bunch of 175SMK's for an AR 308 w/ LC brass. I'm mainly focusing on 4064 and possibly Varget. From what I've read the Federal Gold Medal Match round is basically 4064 (I'll try 41.5 to 42.5gr to replicate the FGMM load), so I will see how that works. The other powder I have been using a lot of recently that I'll load up is Ramshot TAC.
FYI I read a lot about the Shooters World Precision Rifle but checked with the two big suppliers (Midsouth and Powder Valley) and as of last week neither had it in stock.