The barrel on my rem7600 35 whelen was the roughest Ive broke in so far. There was a spot in the barrel that you could feel the patch catch on.
It would take me 15-20 patches after each shot to remove the copper fouling.
I gradually felt the rough spot smooth up and now cleaning even after +20 shots reveals very little copper fouling.
It will hold .75 MOA at 100yds (not bad for a pump rifle and a 7x scope) for a long time between cleanings.
Even though I have to clean it from the muzzle due to the design (I use a muzzle guide)I dont think I have ruined my rifle through cleaning.
I think it is now better off due to the little bit of attention I paid it when new.----.02