I use Triple Seven 2f in my pistols (15gr in the Navy), and it seems to perform a little better than the 3f. Maybe its a pressure issue, but there is certainly less binding.
And no, Triple Seven does not like being compressed- velocity starts getting erratic. I usually put some cream of wheat out of a powder flask over the powder to fill the chamber just enough to allow the ball to be fully seated with a light, but snug, fit. It sounds like more work than it is. The pistols sure seem to like it.