No damage is caused cleaning using a quality one piece rod, bore guide and a bronze brush.
Most mass produced barrels don’t like to be taken back to bare steel and can use a couple of shots to settle in. Hunting rifles I only bother to remove powder fouling but my custom 308 target rifles I aim to remove around 80% of hard fouling at the end of each day.
Two barrels I trialled only cleaning after 400 rounds and never found a drop in accuracy but they did seem to require fouling shots to settle after a cleaning which is not ideal for workhorse competition guns. I also found the barrel life was noticeably less so became a born again cleaner.
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