Development was started in June 1944 by the Uralmash Design Bureau. The vehicle was based on the T-44 chassis and had a conventional configuration, with the front placement of the fighting compartment. In October, People's Commissariat of the Tank Industry considered the SU-122-44 project. In December the design project was ready. However, the SU-100M-2 with the rear placement of the fighting compartment was preferred.
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Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.