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New guns often copper foul badly until they're broken in. There is an easy way to get all the copper out without using 100 patches over several days. You can't scrub copper out it has to be chemically disolved. Ammonia hydroxide is the most common chemical that will do this without attacking the barrel steel. Actually Ammonia will "etch" steel if allowed to become too concentrated. This is why copper solvents like Sweets #7.62 warn against leaving it in the bore for too long. As the volatile carrier evaporates the Ammonia becomes more concentrated. At one point (about 20% solution) it will cause micro-pitting over time.
Here's how to use Ammonia solutions effectively without risk to your barrel's rifling. First throughly clean the bore with a good "nitro solvent." This will remove ironed on powder granuals. Next, throughly degrease the bore using acetone, denatured alcohol, or automotive brake cleaner. Once this is done, find a rubber cup or plug that will seal the muzzle. Remove the bolt or open the action. Stand the gun on its muzzle and using a turkey baster fill the bore up to the chamber with regular household (2%) Ammonia cleaner. Allow the gun to stand overnight. The next day remove the muzzle plug and watch the blue disolved copper pour out. Really badly fouled bores moght require another overnight soak.
Since the Ammonia can only evaporate a very small amount where it is exposed in the chamber, its concentration cannot change much. Also, ther are millions of hungry Ammonia ions in the bore just waiting to combine with the copper. I occasionally use "Janitorial strength" (10% solution) Ammonia when cleaning old Mil-surp rifles using this method. My borescope shows no sigh of micro-pitting or any damage, but a clean bore with no copper.
Here's how to use Ammonia solutions effectively without risk to your barrel's rifling. First throughly clean the bore with a good "nitro solvent." This will remove ironed on powder granuals. Next, throughly degrease the bore using acetone, denatured alcohol, or automotive brake cleaner. Once this is done, find a rubber cup or plug that will seal the muzzle. Remove the bolt or open the action. Stand the gun on its muzzle and using a turkey baster fill the bore up to the chamber with regular household (2%) Ammonia cleaner. Allow the gun to stand overnight. The next day remove the muzzle plug and watch the blue disolved copper pour out. Really badly fouled bores moght require another overnight soak.
Since the Ammonia can only evaporate a very small amount where it is exposed in the chamber, its concentration cannot change much. Also, ther are millions of hungry Ammonia ions in the bore just waiting to combine with the copper. I occasionally use "Janitorial strength" (10% solution) Ammonia when cleaning old Mil-surp rifles using this method. My borescope shows no sigh of micro-pitting or any damage, but a clean bore with no copper.