The parents of an employee suffered a house fire recently. A .357 revolver was found in a closet in a charred holster. The revolver was fully loaded with 4 brass cased cartridges and two nickel plated cartridges. After inspecting the gun, the owner decided to fire the rounds. None of the brass cased cartridges fired but both of the nickel plated cartridges did fire. I wonder why? On a side note, the 9mm cylinder for this gun was found under what was left of the bed. It appeared to have been exposed to a lot of heat and I was wondering if it was now likely unusable?