He fired the muzzleloader and the barrel exploded. His wife was present at the scene of the accident. She transported him to the hospital ER. This man was in the emergency room within about two hours of his new purchase. Two surgeries have already been performed in an attempt to repair the damage to his hand as a result of the explosion. More are indicated.
In another incident, a different man, with approximately 20-25 years of experience hunting with muzzleloaders / black powder guns, was target shooting on a Saturday with a friend, using his CVA inline. The hospital reports that after being stabilized x-rays were taken which revealed a "large metallic FB with spring located at the angle of the mandible."
In yet another CVA incident, a man with ten years of muzzleloading under his belt was sighting in a new scope on his CVA inline. His brother and nephew were present. After a catastrophic failure, his injuries reportedly consisted of a torn right nostril from the base of the nostril to just below the right eye socket. It took 40-45 stitches to close this wound. His nose and his right cheek bone were broken.
http://www.chuckhawks.com/dangerous_muzzleloaders.htm