The major drawback is that it is a dirty lube, that is the graphite is black in color because it is a form of carbon.
That said I can not see any reason not to use it in certain areas of a gun. As you said cylinder pin, possibly lock work on a sidelock muzzleloader.
When blackpowder is made one of the steps is to add a quanity of graphite, makes the grains flow better and controls staic electricty.
You can add it to bullet lube, many of the older lube formulas use it as a additive.
In many areas conventional oils will be better than the graphite, keep it around you will find many uses for it.
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