A little bit of copper is no big deal, many believe it will actually act as a bit of "lubricant". A lot of copper is a different story and can cause accuracy problems if not addressed. You did not say how the gun is shooting, has there been a loss of accuracy? Is it still shooting well? Many don't clean their rifles until they see the start of a loss of accuracy. If you had a rough throat and didn't get any copper out during the break in of your barrel, you may be now seeing the results of that, hard to say since again, we don't know how well the gun is shooting, accuracy changes if any, etc. Have you ever used a copper solvent on the bore, etc.