Can you really damage the crown, rifling, or something in the chamber that easy with your cleaning rod. Why are there so many different type's ( where materials are concerned ) of bore guides, jags, and rods. Don't use a rod made of SS or Aluminum, and don't use anything but a 1 piece rod is what I have read so many times. Yet there are so many made out of these materials or 1 piece rods out there. Hoppe's is one of the biggest names in cleaning and they sell who knows how many 3 piece cleaning rods. I had a jag that didn't mate up well with a rod and I hope I didn't rough up the the rifling right at it's beginning in the chamber. Opinions please, thank you much !!