It's interesting to see all of the tooling chatter marks in the Savage . I'm not afraid to use a bronze brush , but like anything else you shouldn't over use them . I have seen some barrels ruined with people trying to get them too clean and over using J B or ammonia based cleaners . Keep in mind that bronze makes your copper remover show copper signs if you use a bronze brush . Carbon is an 8 or 9 on the hardness scale and a lot of solvents won't even start to soften it up for removal and like so many other things a small amount of it will cause more to build up faster by catching more of it then a smooth surface . Over all it looks like you are doing pretty well with your cleaning procedures . With the barrel steel being so much harder then the bullets and other things you put down your barrels , except grit in say JB or Tubbs fire forming rounds it will take some time for the Savage to smooth out and speed up .