Varget wasn't popular much yet when I last developed loads for a Swift, so don't have any loads specific for the swift. But 36.5 Varget and Berger 55 Varmint (used to called MEF I believe) shoots extremely well in a VSSF 22-250.
For my old swift, I used nothing but H-380 all it's life. Most accurate factory barrel rifle I ever owned. Ruger 77 Varmint made in 1973. Shot all sorts of 52 and 53 match bullets using +/- 39 grns H-380, 55 Nosler BT's with 41 grns H-380, Never chrono'd the 55 Nosler load, but the 39 grn loads were doing around 3600'/sec. Nothing but Winchester brass and Fed 210 primers.
4064 used to have a good reputation in the Swift, but it doesn't meter nearly as nice as H-380. I was loading a couple hundred rounds at a time so ease of metering was important. 4831 doesn't meter very accurately either for that matter.
Here's some groups with above mentioned loads, I have lots of targets that look like these, but most aren't on the computer just yet.