Because the Germans had captured so many PPSh-41s, a program was started. In this program, the weapons would be altered to fire the German submachine gun bullet. This bullet was called the 9mm Parabellum. The Wehrmacht officially called these PPSh-41s the MP41(r). PPSh-41s which were not altered were called the MP717(r). They were given 7.63x25mm Mauser ammunition instead of the Soviet 7.62x25mm bullet. The German military made German-language manuals to teach soldiers how to use the PPSh-41. These were printed and given out across the Wehrmacht.