I always wet mine with a Solvent or Oil and have never used one dry (for 50 + years). Since Bronze Bore Brushes are quite a bit softer I doubt that they could hurt a quality Bore though. Still - it makes me feel better using a solvent or oil with it and believe that they two together have to work better than just the brush itself.
I use Brownell's Bronze Brushes exclusively because I find them superior in every way over the Hoppes and Big Box Store carded ones. For Revolver Cylinders I use the longer Rifle versions that give almost twice the contact length over the handgun versions. Twice the cleaning action with every stroke.