I've used several products for bore polishing/lapping. JB non-embedding bore compound as well as Bore Bright which appears to be jeweler's rouge both work fine. I've also used Flitz, USP Paste, Maas and Simichrome. Use what you have or what you can get. The main thing is to make sure the rod doesn't come in contact with the bore, even with mild abrasives like these, rod contact in the throat or muzzle can cause damage, so use a good bore guide. :wink: