This will be of absolutely no use to the OP. Well, maybe some use. A little, anyway.
Was a time when I was all "anal" about my Brass Rifles. After all, I have 6 of the things. Use to sit down for regular polish sessions. Me and a can of Brasso. I like Brasso. Just be careful with it. There is actually no finish to damage unless your speaking of the finish on the Stocks. There is nothing more than a factory polish job on the metal works. Anyway, took extreme pride in a nice, really shiny rifle. Then I quit with the polish already.
I shoot the guns. A Lot. Constantly polishing seems(ed) silly. BP and Subs and some Smokeless get all kind of krud on the Brass. Leave it alone. Eventually it will tarnish and look like it's older than you are. Really neat. My main shooting partner's Henry looks like it went through the Civil War. Mine are getting close. You will also save money on Brasso.
But .... if you just abslutely must, you might also want to try Flitz or Semichrome. Rub and buff away. Next time you shoot the thing, time to polish again. Almost as bad as trying to make your match brass look shiny new.