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Remove the Carbon First, then Attack the Copper
Here is what we recommend for an "average" factory barrel. After 25 rounds, or when accuracy degrades noticeably, spray some [MPro7 or GM Top Engine Cleaner (TEC) down the bore from the muzzle. (Insert bore guide in breech first. Keep your MPro7 or TEC in a small plastic pump bottle for muzzle application). Let that sit a bit, then follow with a patched soaked with the same cleaner. Repeat. Slip2000 Carbon Killer works really well also, when applied with soaking wet patches.Then, apply the same MPro7, TEC, or Slip2000 Carbon Killer generously to a bore brush, and run the brush through the bore 3-4 times, breech to muzzle. Allow some dwell time between strokes. Always use a wet brush. GM TEC cleans a little faster but it has some dangerous solvents, so handle with care. MPro-7 is non-toxic, non-flammable, non-corrosive, and biodegradeable. It comes in liquid or gel, and is also sold as "Hoppes Elite" cleaner.