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I use Tynex plastic bristle brushes and Tetra bore cleaner.
If you are doing a "first cleanup" on a filthy bore, then burn up a copper brush to attack the worst of the fouling.
Once you get down to the barrel metal, you can start using plastic bristle brushes which are not as effective as brass, but they will survive copper removing chemicals and remove "new" fouling just fine.
Tynex bristles are also much easier on the lands.
If you are doing a "first cleanup" on a filthy bore, then burn up a copper brush to attack the worst of the fouling.
Once you get down to the barrel metal, you can start using plastic bristle brushes which are not as effective as brass, but they will survive copper removing chemicals and remove "new" fouling just fine.
Tynex bristles are also much easier on the lands.
