You really should get you shots for "Bockbüchsflinte", "Kipplaufbüchse" und "Bockdoppelflinte".
The is no cure for "Doppelbüchsdrilling" known to modern science, yet...
https://www.merkel-die-jagd.de/de/produkte/gewehre/drillinge/db-dr-961l/
Last edited by Ready; 10/25/18. Reason: Scientific literature link added