any firm in Suhl is suspect to have build rifles in 11,2x72. if a customer make an order it would happen.
my own rifle in 11,2x60 Schüler was build from Ernst Steigleder in the typical fashion this firm was making Mauser hunting rifles. he got the barrel maybe from the same barrel maker who make also the barrels for Schüler. and maybe the chamber reamer was borrow from Schüler for this one rifle.
most of the gunmaker familys were related there anyway.