But KV-13 due to his small demensions has heavier armor (120mm in front) against full-size KV-1s. It was so called "light weight and speedy" heavy tank as well as KV-1s (like T26 heavy tank against M6). 122mm U-11 is a replacement of F-32/ZiS-5 due to shortage of them during factory evacuation All 203mm SPG projects were cancelled due to low efficiency against armored concrete, low ammunition, too heavy weight and lack of 203mm guns. SU-203 - there are some different projects with different 203mm howitzers and mortars. U-19 - NOT A S-51! This is another giant bunk-buster full armored SPG project with 203mm B-4 in hull (imagine SturmTiger with B-4 howitzer) U-18 wooden mockup photo - in fact is ZIK-20, which was 152mm in real Obj212A - Bunker-buster SPG with 152mm/L50 Br-2 gun on 7-wheels chassie (as Ferdinand on steroids) Production didn`t started due to war begans, but serial KV-1 in fact has much features of KV-6 - 90mm armor and F-32 gun. Obj 222 aka KV-6 - adopted for serial production improved version T-150. Later hull was used for unfinished Obj 223 aka KV-3 (second use of this name) Obj 221 - one of the KV-220 (Obj 220) prototyps, not completed. It was on active service until aug.43 and then scrapped in Leningrad. T-220 - one of two 220s after "destroying" was repaired and used as training tank till 1944 KV-1 summer-autamn prod has 90mm welded turret and screens on front armor KV-1 spring and early summed 41 prod - are 75mm armor with screens KV-1 initial series has stamped turrets 75mm armor too KV-1 U-0 prototyp has 45+76mm cannons in stamped turret T-103 - bunker-buster SPG with 130mm B-13 in turret (alt to SU-100Y) T-100Z - T-100 with 152mm M-10T howitzer in main turret SU-100X and Y - 130mm B-13 bunker-buster SPG based on T-100. Some additions and corrections to history chapter: 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.
The KV-13 program's IS-85 prototype was accepted for production as the IS-1 (or IS-85, Object 237) heavy tank.
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