Get yourself a bore guide and a good one-piece rod (Pro-Shot or Dewey), and you won't have to worry about cleaning damage.
My gunsmith (Ron Hoehn, 1999 NBRSA Nationals 1 gun, 2 gun and 4 gun winner) sez to break in with fire one, clean, for five rounds, then fire three, clean for five groups. This is done while fireforming 20 pieces of brass.
I use Butch's Bore Shine, and use two-three soaking patches. Then 10 strokes with a brass-core brush (NO STEEL - EVER), then let it sit while I load. Then I patch it out with three wet patches, then a couple of dry ones, then I run a patch of Sweet's through to check for copper color. If I see any, I repeat the entire cleaning process, including the brushing. If not, I patch out with a couple of dry patches, and then follow with a patch soaked in light machine oil, then a dry patch to get most of the oil.