Early testing displayed a number of minor problems, but, by the time these were being solved, the 150 mm of penetration was no longer considered effective against modern tanks, even late-war designs like the Panther. The warhead was already straining the capabilities of the cartridge and its range was already considered too low. Modifications to improve this began, but in 1947 the RPG-2 program started as a parallel project. Development of the RPG-2 was carried out by the GSKB-30 design bureau, originally part of the Commissariat for Munitions, but in the post-war period handed to the Ministry of Agriculture to help design farm equipment.