Just how badly fouled are your bores? In normal cleaning, I've found that there are always traces of copper fouling after a thorough cleaning. If the little bit of fouling that is remaining in the barrel doesn't affect accuracy, I wouldn't worry about it. Another thing, how many rounds have been down the bores? Most bores need a few hundred rounds to smooth out the burrs and small machining high-spots.
-------------------- Lo do they call to me,
They bid me take my place among
them in the Halls of Valhalla,
Where the brave may live forever.