Only one type of artillery round other than the W48 was produced in large numbers. It was the W33 nuclear warhead for use in an artillery shell. About 2,000 of these warheads were produced from 1957 to 1965. Each XM422 projectile was 940 mm long, it had a projectile weight of 243 pounds. XM422 were fitted with a triple-deck mechanical time-base fuze. They were to be fired from a standard eight-inch howitzer, if the use of this weapon had ever been called for.