I would skip all the hassle and remove the moly from the bullets if they are not already loaded. A strong solvent will usually take it off or a spin in the tumbler.

I would never use JB on a Dyna Bore Coated barrel unless I was getting ready to re-treat it. Don't know as I avoid moly but I would think the barrel would take much more prep after moly before you could re-coat with DBC.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli