The reason for shooting a person with rock salt is to create a wound that is infused with salt. A situation that would cause extreme pain. If someone actually did that, the legal system would have a field day with intent to maim, torture, etc.
Also, rock salt is an impure substance taken as-is from underground mines complete with small stones and dirt. Do you really want to shoot small stones(harder than barrel steel) and dirt through the barrel of a valued gun?
Furthermore, salt is hygroscopic, that is, it has an affinity for water, and will accelerate the formation of rust in the gun barrel.
In short, there are several good reasons not to fire salt through a shotgun, and no good reasons to do it.
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