Jackson, Michigan. A couple of months ago the trial of a person charged with the death of a teenage girl he shot in his backyard with a rock salt was concluded. I am sure that she would agree that rock salt can be lethal.
That aside, salt is hygroscopic, attracts water, resulting in rust. Also, rock salt as mentioned is very impure form of mined salt frequently containing small bits of stone and dirt. Rock salt is not something a normal person would want to shoot through the barrel of a shotgun.
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