Abstract: A tank supporting a large-caliber firearm which can be raised and lowered relative to the tank chassis. A first magazine is hingedly connected to the firearm at its rear end, and a second magazine is hingedly connected to the tank chassis. When the barrel of the firearm is in its zero traverse position and in its lowermost position relative to the tank chassis, the first and second magazines are interconnected and a hoisting apparatus lifts successive rounds of ammunition from the second magazine to the first magazine, and the rounds are then rammed into the barrel of the firearm.