I’m sure it’s possible with poor quality cleaning rods, aggressive solvents and poor processes, but I also think too many shooters baby their barrels. A brass or synthetic brush is much softer than barrel steel and only likely to cause damage in the hands of someone with no understanding. Personally I use bore guides and remove my brush if it passes the crown. Other than that I clean regularly and leave a light coating of CRC Long Life in the bore.
It probably more the case that insufficient cleaning causes more problems. There are often threads on here regarding carbon rings and barrels suddenly coming good after a real rod out to get carbon out of the grooves and copper off the lands.
I’m also a believer in a light polish of the throat with Autosol every couple of hundred rounds.
This is an emotive subject, and, like religion or1080, not worth arguing about. Find what works for your needs in your rifles and get out to shoot.
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