I have a Weatherby MK.V in 30-06 that looked much worse! I ran a Kroil'd patch thru it, and a series of dry patches. Looked like a different barrel. I then ran a series ISSO patches thru it, and they were coming out black as coal. I finally made a phone call to see what I was pulling out of the barrel, and it turned out to be the nature of ISSO.
On the otherhand I used to have a 270 in a Remington 700. Nothing on this planet would get the copper fouling out. You could scrub that barrel for hours and hours. Sweets just made the copper shiny! But the rifle shot just fine for what it was (3/4"-1" groups) I put about 250 rounds thru it before I got rid of it (wish I'd kept it). Been a nice rifle to build a .338-06 out of. On the otherhand I had another 700 VS in .223 that was so rough it actually ripped up patches. Had tight spots and loose spots here and there. I cut the chamber end off and cut a new chamber (2.75" off the big end), and cut about three inches off the muzzle to remove a loose muzzle area. Bore is still rough and ugly, but will shoot in the low fours. I've seen some ugly barrels shoot bug holes, and seen several high dollar BR grade barrels that didn't shoot any better that a factory barrel.
gary