I had a knowledgeable buddy bore scope my Cooper .204 before a trip for prairie dogs. I had quite a few rounds (1500+) on the barrel. I almost panicked when he showed me pics of the bbl. Looked more like the surface of a rough paved road.
Took it to the range and it shot 1/2" groups at 200 yds. I took it two more trips out west before having to re-barrel it.

Also had my other .204 bite the dust before a trip, but a good copper cleaning straightened it out.

Even if the bbl looks terrible, it still may be a shooter!