This heavy SPG on the basis of the ISU-122S was developed in 1944, with a prototype built in October. The 130-mm S-26 gun, based on the B-13 naval gun, was mounted on the ISU-122S. The vehicle underwent automotive and firing trials by 1945, but penetration characteristics were inferior to those of the 122-mm guns, and the war was drawing to a close, so the vehicle never entered service.
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Expected
frags:
0.97
Expected
spot
0.41
Expected
defense points
0.65
Expected
winrate
50.73%
Tier VII field modification
available for tier IX-X tanks
Tier VIII field modification
available for tier X tanks
-3% to dispersion during hull traverse
+30% to suspension durability
+15% to maintaining speed when crossing all terrain types
-5% to hull traverse
-3% to aiming circle size
-5% to aiming speed
+2% to view range
-6% to concealment after firing