You use Iosso bore paste or JB Bore taste. You use a brush one size bigger and saturate the brush and turn it around and around like 20 times and then clean it out(the paste) All paste turns black when used, you are looking for a dark brown color. If you knew someone with a bore scope it would tell you immediately if the hard carbon ring in the neck area of the chamber is there. Carbon rings are always an accuracy killer.
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