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No lube of any kind should be used on jacketed bullets. The wave that stuff builds up as the bullet pushes it in front of it going down the barrel will sometimes "ring" the barrel. That means the barrel steel gets permanently bulged at that point.
Rain water's often the cause of ringed barrels in hunting rifles. Leaving the oil you put in after cleaning it to protect it from corrosion is another cause.
The only lube I know of that can be on a bullet when its shot is the special lanolin mixture Sierra Bullets uses on their copper bullet jackets they're made then stuffed with lead cores and finally pointed at the last stage of production. 10 are grabbed as they fall out of the pointing machine into a barrel then seated in resized, primed and charged cases to test in their rail guns. That lanolin mixture does not cause problems 'cause it's very, very thin.
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