I use Montana Extreme Copper Killer (really stout vapors), or Patch Out when I really want to get after the copper. Either can be left in the bore for many hours without harm. I use Break Free CLP or Rem Oil to get carbon in the bore. These days I don’t worry as much about copper fouling and let the rifle tell me when to knock the copper out.
For lubricating oil, I have used Mobil 1 5W30 for years.
Last edited by GF1; 04/19/21.
