One characteristic common to all the German recoilless guns, was that they used ordinary shells, albeit with a different cartridge to cater to the unique issues involved in the recoilless principles.
This gun used HE shells from the 7.5 cm Gebirgsgeschütz (Mountain Gun) 36 and the anti-tank shell of the 7.5 cm Feldkanone 16, neuer Art (Field Cannon, New Model).