What I do is take a patch that wont fit down the barrel like a 30 cal patch and cut the corners off.Then take JB,Iosso<40x cleaner and saturate the patch and insert till you feel it stop with light pressure.Then turn the rod over and over at least ten times,remove and do the same thing with a clean patch,borescope.If it isnt metal showing,do it again and look at it,if the barrel metal is showing you have removed the carbon ring in the chamber which is the most common cause for loss of accuracy.Also do it to the barrel like 82 boy suggested.The abrasive is so mild it wont hurt a thing.It is non imbedding meaning it will come out of the barrel easily with patching and brake clean(crc brand is the least stinky to use) and get the rags and anything saturated out of your house when you are done with a well ventilated area being a must.You can also use a 22 cal brush with a patch wrapped around it with the JB or which ever you use to really get the carbon out.Good luck.