What bullet did Jack Ruby use?

Jack Ruby used a .38-caliber revolver when he shot and killed Lee Harvey Oswald on November 24, 1963. The specific model was a Colt Cobra revolver. The bullet that struck Oswald was a lead jacketed hollow point, which was standard for that caliber at the time. Ruby's actions were motivated by a mix of emotions, including anger and a desire for justice after the assassination of President John F. Kennedy.