The only thing I can say is if you are cleaning from the muzzle end is make sure your rod is not rubbing the edge of the muzzle when you are pushing in or withdrawing the rod by pulling or pushing off center of the barrel.

Another thing to watch is cleaning with a cheap "one size fits all" cleaning rod that is small enough to clean a 22 barrel. It can flex and bow in the barrel and create wear marks. Another thing to watch for with cheap rods is they are not smooth where they screw together creating an edge to rub the sides as it flexes down the bore.

I don't think you would have to worry so much about a rod made of a softer material like brass or aluminum.

I also like the Hoppes Bench rest No. 9 for copper fouling and regular No. 9 for everyday cleaning.

BW