The ISU-152-2 is a prototype modification of the ISU fitted with a much larger howitzer
A prototype was developed in 1944. In April 1944, in an attempt to increase the firepower of the ISU-152, a high-powered variant of the self-propelled gun was developed at Factory No. 100, designated ISU-152BM (ИСУ-152БМ) , sometimes referred to as the ISU-152BM-1 or ISU-152-1. The factory’s designation was Object 246 (Объект 246). The “BM” (“БМ”) designation means “High Power” (“Большой Мощности”). The main purpose of the ISU-152BM was to fight against heavily blinded tank destroyers such as the Elefant and Jagdtiger. It was armed with the BL-8 (БЛ-8) 152.4 mm long-range cannon, which, unlike the ISU-152’s cannon, was not a howitzer cannon. The cannon had a maximum range of 18,500 meters (20,232 meters), with a high explosive design of 43.56 kg (96.0 lb), which had a muzzle velocity of 880 meters per second (2,887 ft/s). The overall length of the cannon was over 8 meters (26 feet), with a barrel length of 7,620 millimeters (300 inches) (50 calibers). The armor-piercing design, weighing 48.78 kg (107.5 lb), had a muzzle velocity of 850 meters per second (2,800 ft/s).
However, this tank is not without drawbacks. It of course reloads slowly being a 152mm cannon, but the cannon itself is extremely long and prone to getting shot at. Moreover, the cannon only has 2 degrees of gun depression and laser-thin horizantal guidance, meaning that the chassis has to be aimed by moving the entire tank around - which is a huge drawback considering ISU tanks have the turn time of a battleship.
A good BR for this would be around 5.7-6.0, Since Sturer Emil is at 4.3 for reasons of speed and armor, the ISU could not be placed at BR’s higher than 6.3, after all, War Thunder is a game where mobility and speed are more important than a strong cannon or heavy armor, since it’s chassis has no armor or mobility, but the gun can delete an M103 by looking at it.
