I have been using more 3f, because it works and that is what I have the most of on hand. I deliberately went to it in my Pedersoli .62 Trade Gun because I felt 2f was not getting down near the touch hole and this was causing slow ignition. True or not I do think (feel?) that the 3f is better in this application. I do plan on smoothing and opening up the touch hole liner to help as well, although since switching to 3f as a main charge I really have not felt the need. But since when is leaving well enough alone a solution to anything? ; )