I recently did a flint conversion on mine and picked a load out of guessing. 50 g. of FF, .440 rb with .017 blue ticking soaked with Hoppes BP+. More often than not, it shoots in the same hole at 25 yards. from a bench rest. I most likely will stick with that load, but may see what it likes in FFF in case that's what I have with me,just so I know.
(I miked my patch wet using the friction thimble on the micrometer,FYI)