 Because of tungsten shortages, HVAP rounds were constantly in short supply.Priority was given to U.S. tank destroyer units and over half of the 18,000 projectiles received were not compatible with the 76 mm gun M1, being fitted into the cartridge case of the M10 tank destroyer's 3-inch gun M7.Most Shermans carried only a few rounds at any one time, and some units never received any.