Brushing JB really does NOT do anything .... You need to use it on a FIRM / TIGHT fitting patch used on a round jag tip. The JB needs to be forcefully burnished against the bore surface for it to actually have any surface smoothing properties. That done and bore cleaned with solvent
... Running a few patches with TREWAX clear paste wax will further seal the surface porosity and decrease fouling.
* Slather a patch with wax and work it in back & forth ... leave it to dry in bore .... SHOOT it 30-40 shots to clear the wax & then run a few dry patches. DONE !
TREWAX is used on hardwood floors etc ...
Been using on AG barrel bores for years ... It works !!!