 By World War II , the guns used Type 91 armour @-@ piercing , capped shells . Each of these shells weighed 673 @.@ 5 kilograms ( 1 @,@ 485 lb ) and was fired at a muzzle velocity of 770 – 775 metres per second ( 2 @,@ 530 – 2 @,@ 540 ft / s ) . They had a maximum range of 25 @,@ 000 metres ( 27 @,@ 000 yd ) at + 20 degrees of elevation and 35 @,@ 450 meters ( 38 @,@ 770 yd ) at + 43 degrees after modernization . Also available was a 625 @-@ kilogram ( 1 @,@ 378 lb ) high @-@ explosive shell that had a muzzle velocity of 805 metres per second ( 2 @,@ 640 ft / s ) . A special Type 3 <unk> incendiary shrapnel shell was developed in the 1930s for anti @-@ aircraft use . 
