Under the heading of: "First do no harm", I reserve bore cleaning after examination, and also use softer bristle brushes. Hoppes, Butches, Young's 303, and Rangoon Oil, or Tetra -all have a part to play.
Moose milk-oil and a bit of water- for original Sharps and Winchester 1885s. And follow the Sharp's original factory practice of a quality oil lightly applied to the bore...after thorough cleaning.
Black powder requires a different protocol.
(Avoid the early 1900s primers as well as GI wartime versions, specifically those in 30 GOVT 06.) Mercuric or other chlorate priming compounds were and are responsible for
very pitted or otherwise bad bores. US bore cleaners always had a bit of water added, to help dissolve corrosive priming residue.