I recently picked up my 30p-1 after a long wait. Went out and shot it today. The reviews are right... it's awesome. It was time to clean my rifle and when I pulled the can off I noticed it left a lot of carbon on the muzzle end and it really caked on the crown. It's a R&D precision 308 with a really nice polished crown at the end of the bartlein barrel. What do you guys use to clean the crown? I decided to very gently drimel it with a felt pad and rouge. I'm not a clean freak but figure the crown is important to keep clean.