I think Varget is a good choice with light bullets. Varget is known for low SD’s, consistent performance, probably one of the reasons why the target crowd likes it.
I’d probably try RL-26 with 147’s.
BTW, I use Lapua brass when and where I can. IME, this Hornady brass is very good. The batch I’m using is pretty close to Lapua. Some may squawk at that. Just reporting, you decide.