 By World War II , the guns used Type 91 armor @-@ piercing , capped shells . Each of these shells weighed 1 @,@ 020 kilograms ( 2 @,@ 250 lb ) and had a muzzle velocity of 780 meters per second ( 2 @,@ 600 ft / s ) . Also available was a 936 @-@ kilogram ( 2 @,@ 064 lb ) high @-@ explosive shell that had a muzzle velocity of 805 meters per second ( 2 @,@ 640 ft / s ) . A special Type 3 Sankaidan incendiary shrapnel shell was developed in the 1930s for anti @-@ aircraft use . 
