In all of my .54's, I shoot FFg. I have shot FFFg in them, but the FFg give me better groups. I took my friend out to shoot his .54 CVA Hawkens for the first time. I gave him some FFg to start. He was shooting shotgum patterns at 50 yards. I then gave hin some FFFg to try. He started shooting one ragged hole groups at 50. Like tiger said, try both and see which one your rifle likes best.