A cross bow includes a main string, a support engaged with and supporting a bow, a triggering device for cocking and firing the bow, a loading string attached to the bow and a hook device attached to the support and operable for receiving the loading string. The bow may be half-cocked by engaging the loading string with the hook device, and thereafter fully cocked with the main string. Another embodiment of the cross bow includes a support with two barrels therethrough, and two bows mounted on the support for separately launching projectiles such as arrows, balls, air gun pellets, or bullets, through the barrels. A magazine may be provided for each barrel to supply projectiles.