I need advice. just last night I found rust in my bbl. about 5" from the muzzle, a spot about as big as an pencil eraser. I have never had rust in a bbl before and I don't know where this came from. I soaked for about an hour with regular nitro solvent, and then swabbed it with iosso paste about 30 strokes, STILL THERE! I am a clean freak about my guns and cannot figure out how I got rust. My routine is usually 1. butch's bore shine, 2. hoppes #9, 3. Iosso paste, 4. #9 to flush it out, 5. oily patch. I need the rust out and no more in.