Dump that piece of poo bore butter! Its nothing more than a wax that builds up and causes rust issues.
Take that barrel off and put it into a bucket of boiling hot water and pump it repeatedly.
Next use something like birchwood casey gun scrubber or carb cleaner and flood the bore good and again, swab it.
Follow up with a good oil like Barricade, Rig #2, montana xtreme gun oil or the bore conditioner.
Bore butter is only good for patches when shooting patched round balls.
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