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Using a patched .490 round ball, I'd start with:
20 grains FFF. Fire five shots and wipe between shots. Clean out barrel after 5th shot and then try
25 grains FFF. Same procedure as before, and then
30 grains FFF, etc., 35 grains FFF and if the mfg uppper limits allow it, 40 grains FFF.
Bench rest all shots at 25 yards and make notes of each group. You're shooting for load development right now, not accuracy. You can adjust the sights (if any) later.
You may want to repeat the test with a different thickness patch or different size ball (like .495). Always take notes and mark down which one shoots the tightest group for that gun.
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