DBC = Dyna Bore Coat? It might be a good idea to run some patches of JB Bore Cleaner through it to smooth the interior, and even finish it off with JB Bore Polish. Then, if DBC = Dyna Bore Coat, your bore needs to be cleaned down to bare metal, the DBC is allowed to cure for 24 hours, then you take it to the range and fire 10 rounds rapidly to cure it. If you got it sufficiently smooth with the JB products, your copper fouling will all but disappear. However, powder fouling from a 'dirty' powder will still be some what of a problem, but not near as bad as you're experiencing now.
