I bought nearly and unfired S&W 686-1 stainless .357 Revolver. Upon firing the front of the cylinder got a black ring where the cylinder gap is.
Is there a cleaner that removes that powder burn?
Also have a Model 14-6. I shoot it a lot. It builds up crude that I can not remove. This is on the circumference of the front of the cylinder between chambers. What removes this?
I have tried Hoppes 9 and Shooters Choice. I have allowed them to set over time and still they do not remove the crud.