Georgy Semyonovich Shpagin worked with Vasily Degtyaryov on a gun that fired what size cartridge?
Georgy Shpagin: Georgy Semyonovich Shpagin (Russian: Георгий Семёнович Шпагин ; April 17, 1897 – February 6, 1952) was a Russian weapons designer. Georgy Shpagin:  He is best known as the creator of the famous PPSh-41 submachine gun, as well as working with Vasily Degtyaryov on the DShK heavy machine gun.
i don't know