Varget works well with the Sierras and also the 178gr AMax for me. 4064 works a little better with the AMax. At 600yds, it's a toss up but at 1K, the AMax is noticeably better. I would start at 43.5gr and inch up to ~44.5gr with the Varget.
Savage with a 1:10 Benchmark 24" barrel and Stockade stock.
Funny but the same loads also work very well in my factory 22" Savage.
Edit to add: I should mention that my loads were in Lapua brass.