O.K. Stop with the “this is what the black powder cartridge guys use” you aren’t shooting a cartridge, or a breechloader, so the analogy has no bearing on shooting a muzzleloader. Cartridge shooters have the option of cleaning from the breech, you don’t. If you could push the crusty mess out the barrel from the breech there would be no problem, but you can’t. That crusty mess either plugs up your vent liner, or your flash channel, depending on your ignition system.
Petroleum jelly is not a high temperature lube designed to handle extreme heat, and pressure, so these two things can lead to polymerization of the lube which sticks to the bore. The same thing is true for bees wax. Both of these components have a relatively low flash point. You want something with a high flashpoint. Bear, Mutton, and venison tallow, have these properties. They do get loose in hot weather, and can be stabilized with a small amount of bees wax. But that is the only instance I would recommend adding bees wax to patch lube.
Hungry Horse