Incidently, with a short testing span, you can have accuracy loads with both 3f and 2F for a single rifle, no matter the calibre - from .36 to .50 at least. I know some guys use 3f in .50's, .54's and .58's while I don't. I do have accuracy loads for both my .40 and .45 with both 3f and 2F. The accuracy loads strike the same point of impact and make identical group sizes, so if I'm running low on 3F, I merely go up 10gr. weight of charge and switch to 2F. As I noted earlier, my pans get 4f - if I have it, which is about 99% of the time.