That was their problem. They took in so much diffrent designs and foreign designs. all had diffrent calibers and shell types
"Kamerden!ich need shells for the 24 cm Mortat 39"
"Lets schee, i have 7.5CM shells of 4 diffrent artillery guns, namely 7.5 cm FK 16 nA • 7.5 cm FK 18 • 7.5 cm FK 38 • 7.5 cm FK 7M85 . Hm lets see 5 diffrent 105mm shells, ooh a 100mm gun, then 5 150mm diffrent type of shells, 17vm and 21cm. then 28cm and 35.5cm. Nope keine 24cm shells.