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Trials to determine accuracy of the T-28 armed with an L-10 gun on the move were performed while driving at a speed of 12-14 kph, firing at a target 800-1000 meters away. The trials were performed in two sets: one with the tank driving towards a 12x10 meter target, the other with the tank driving parallel to a 10x10 meter target. Aiming was done with the PT-1 periscopic sight, firing was done using the foot operated trigger.
While driving towards the target, 14 out of 23 shots hit. While driving parallel to the target, 15 out of 25 shots hit. These results were considered satisfactory.