Jaytee: Five of my seven Varmint Rifles in 220 Swift caliber PREFER IMR 4064 powder!
It's worth it ("measuring" your IMR 4064 loads for the Swift).
Reconsider your opposition to this great and traditional powder.
One of my Ruger 77 Varmint's is a "Bi-Centennial" (Liberty - 1976 vintage) Model and loves IMR 4064 and Sierra 55 grain "Blitz" bullets (not the BlitzKings).
My other Ruger 77 Varmint is the newer V/T Model (stainless laminated stock 26" barrel) and it loves IMR 4064 and the 52 grain Speer hollow-point with flat base.
Best of luck with your Ruger heavy barrel Swift.
Hold into the wind
VarmintGuy