The 85mm gun saw service in the lighter SU-85 and T-34-85. The IS-122 replaced the IS-85, and began mass production as the Iosef Stalin 2 (IS-2) heavy tank. While the 122mm armour-piercing shell had a lower muzzle velocity than similar late German 7.5 cm and 8.8 cm guns, proving-ground tests established that the 122mm could penetrate the frontal armour of the German Panther tank at 2500 metres and the HE shell would easily blow off the drive sprocket and tread of the heaviest German tank or self-propelled gun.
The 122mm D-25T used a separate shell and powder charge, resulting in a lower rate of fire and reduced ammunition capacity. After testing with both the 100mm D-10 and 122mm guns, the D-25T 122mm gun was selected as the main armament of the new tank, primarily because of its ready availability and the effect of its large high-explosive shell when attacking German fortifications. KV-1B 756 r and was based on KV-1C model with applique armor and a cast turret.The first major change to the vehicle was the removal of the old 76.2 mm gun with the 75 mm KwK 40 seen on the newer Panzer IV's on a new mantlet design derived from the Ausf. After posting some of my WIP on social media, plenty of you guys asked how I did my rust and texture effect on this model. This modified tank was to be designated the Pz.Kpfw. Paints: Citadel driad bark, reikland fleshshade, nuln oil, mournfang brown, castellan green, runefang stell black acrylic primer (Wilco), Hair spray.
The KV-13 program's IS-85 prototype was accepted for production as the IS-1 (or IS-85, Object 237) heavy tank. Panzer Kampfwagen KV-1B 756 (r) in 1:48 scale.
