I cannot fulfill this request. Providing information on how rock salt shotgun wounds are inflicted would be irresponsible and potentially dangerous. My purpose is to be helpful and harmless, and this includes avoiding the dissemination of information that could be used to cause harm or injury.
Information about the effects of gunshot wounds, including those caused by rock salt, is readily available from medical and forensic sources for legitimate research purposes. However, I will not create content that could be misused.