Reply To: Bench Rest Barrel Cleaning
Even soft materials can scratch harder materials. I can take a high speed steel tool bit and put a scratch on a carbide tool bit. It all depends on the cutting edge on the tool. Experienced shooters in the powder burning groups will use a guide on the end of their barrel so the rod does not touch the crown. You can probably use a brass rod but use some of the guides you can buy to protect that crown and your rod travels down the middle of the barrel without making contact with the sides.
my 2 cents worth