Imr 4064 has been my go to powder for long time. I have been loading 54R, 7.5x55 and 223. For a while i could not get 4064 i started using Reloader 15 i really like it. Imr 4198 was a big surprize it shot very in my Mini 14 it shot very well and shoots cleaner than any other powder i have used in a semiauto rifle.