I have used Viht N140 at a 1:1 alternative to Varget.Vit N140
In my experience I have had better luck with IMR4064 over Varget in just about any cartridge I have ever tried them in. I've never understood the love for Varget its never performed the way I would like it to for me.
I haven't been able to test it myself yet, but have been told that Norma 203B is basically "varget in a different bottle". Again, just what I've heard among fellow shooters.