If you use a bore guide and a jag I don't think the rod ever touches the inside of the barrel. I only use Dewey products and I've used them for years on my custom made bolt guns that cost in the $4k+ range and if I thought they did anything trust me I wouldn't use them.
Same here. If you think about it, anything that's in the bore (copper, lead, carbon fouling), was already shoved down the bore at high velocity while firing. How would these elements scratch your bore just because they got picked up on the rod?
All I do is make sure and clean the debris and fouling off the rod frequently. I doubt it helps, but it can't hurt.
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