What should be avoided during the process of copper removal from the bore?

The use of harsh abrasive polishing methods during copper removal from the bore should be avoided because they can cause significant damage to the rifling and surface of the barrel. Abrasive methods can scratch or erode the metal, which not only affects the integrity and accuracy of the firearm but can also lead to long-term wear, resulting in poor performance over time. Maintaining the integrity of the bore is crucial for optimal accuracy and proper functioning of the firearm.

Other methods, such as using mild solvents or checking the bore for wear and tear, are generally safe and can be beneficial. Employing lead bullets can also sometimes assist in cleaning, making them less problematic compared to harsh abrasives. The focus should always be on preserving the barrel's surface while effectively removing residue.