Why didn't Germany or Continental Europe develop big bore cartridges like the British did?

[PerH]

But that is something different than if, for example, a company like Mauser had brought a rifle onto the German market with the caliber "10.57x73/ 10.75x73 Mauser" instead of .416 Rigby or .404 Jeffery. But never mind. The Germans were vastly superior to the British when it came to repeating rifles and their calibers. While the British were unbeaten when it came to double-barreled rifles and their calibers, even though the competition from Germany, Belgium and Italy was already pretty strong at the time. You could also say that it was something like a civil arms race and, as in war, all means were permitted - on all sides

Barella msde double rifles in .404 Jeffery , at kleast one exist and it have no history of whom, what . Maybe owner had a .404 bolt also . Pictures online of it .