I've only ever used ffg in the rifle, 45 to 75 gr, by volume, of course. I have not done a full course of variations to see what it likes best, but my memory says 60 gr was pretty good. Seems like 75 grouped well too, but I didn't take notes and those targets are long gone. Also, I was shooting at 100 yards from a rest with the stock, very rudimentary, iron sights, so the groups were pretty big - 7-9" as I recall, so there wasn't much to say for sure that one load was much better than another.