many people experience good luck with conicals in B.P. pistols.
especially in the ROA pistols.
i have had better luck with a .454 ball as noted by many others on the forum. as for lube any natural fat product mixed with beeswax is good.
many use crisco and parafen based wax. but regular lubes & oils used with smokeless powders tend to harden up , crud out if you will , with the b.p. fouling.
the key to using a conical is to keep them straight in the cylinder when loading.
s.m.