Implications of black with jacketed are one, no lube to soften the fouling. I've never shot jacketed bullets over black but don't believe I would expect much for accuracy. Sort of a second issue is the harder jacket material of jacketed bullets working on the softer iron/steel barrels of the BP era. Hawk bullets annealed dead soft at about 25 BHN are an exception...albeit a rather pricey exception for plinking. Personally I'd just skip them. Black and cast go together like peaches & cream.

NRA Benefactor 2008
NRA Patron 2007
NRA Endowment 1996
NRA Life 1988