Same species. Just different sizes based on the location and sources of food. Armchair expertise.

Can't see why that makes a huge difference for cartridge choice? A .30-06 won't suddenly kill a brown bear? Or was it grizzly?

So many many useful cartridges missed out from the "7", I guess because advertising not paid for them!

A very obvious choice, the Euro 9.3x62. And the American .338/06.