Ya think!Hi and welcome. I always run a brass brush down my rifle barrels a few times to get any lead fouling out, I use Hoppes or Mil. spec. bore cleaner along with the brush to loosen and remove any buildup, the follow it with some clean patches . I imagine the chamber brush was a bit hard to push through the barrel but I wouldn't think it did any damage. I've used 12 ga. brass brushes to clean .45 cal. barrels after shooting particularly dirty ammo, it hasn't damaged any rifling in them.