I'm not all that up on Winchesters, but it looks like a Super Grade model - forend tip, cheek piece.
How did it shoot?
If it shot well, I don't think I would think much of the patches not coming through clean. I have a couple rifles like that and eventually I just gave up once they were more or less clean.
Could give it a good long soak in some sort of solvent and see what results.
Also, I hate bore scopes.
You can take a good shooting rifle and looking at it through a bore scope can make it look like a total disaster!
Lastly, if the barrel is already non-original (by date anyway which I can't say makes it so) AND the bore is bad, you could rebore/chamber it to 350G&H Magnum. Not enough of those around!
Nice rifle!