I personally consider Varget to be too fast a burn rate for the .220 Swift.....Hodgdon has published data for it (see previous posts) but I' d recommend a slower powder.....H414 for example.
Vapodog I am trying H-380 in my swift now, I have used IMR4350 in it for a long time with great results. I just recently bought a 6mm REM and this is mainly what I am trying the VARGET in. I am trying to get high velocity with 55gr bullets because I will be using it for varmints only. Thanks for your input.