The C-100 is a high-velocity gun with a 100 mm bore diameter and a barrel length of 53.5 calibres. Its muzzle velocity of 895 m/s gives it good anti-tank performance by late-war standards. Initially it could penetrate about 146 mm of steel armor plate angled at 30 degrees from 1,000m away, which was superior to the German 75 mm mounted on the Panther tank and the original 88 mm guns such as the Tiger I's, but not as good as the Tiger II's longer gun. After the war, APDS and more modern ammunition types were developed. A more effective high-explosive shell was developed, taking advantage of the larger 100 mm bore.