I used to use 2f in my 50Cal Poorboy, then one day I tried 3f because I ran out of 2f and the 3f worked much better. I got better accuracy and never went back to 2f. In my opinion it burns cleaner than the 2f, you get all you can from the 3f verus the 2f. Also my Poorboy has a LONG barrel, and the 3f probably burned more of the powder out of the barrel than the 2f. Use whatever works best for you. Best of luck. BP