Interesting there is no smaller calibres in this line up. German hunters often like to have a smaller calibre with a medium calibre. Or matched with a shotgun barrel. Say a .22 centrefire with a medium, eg 7x65R. As when sitting in their hochsitz it allows a variety of game to be shot.

Myself I like the 9.3x74R and often do not see the need to match the 9.3mm with another medium sized cartridge. The 9.3x74R to me is quite mild.

Nicely balanced lighter medium doubles in the 7x65R class are a wonder though.

It would be interesting to see the regulation process involved here, but I guess it is not actually different from a firearm with two carrels chambered the same.

I used a 9.3x62 Under and Over Heym at the International Challenge in the balloon shooting competition. I do not remember what the model number was. It was a very affordable rifle and also very accurate.