That's about where I'd come down. "For North America" most people factor in 'big bears" even though most people will never hunt big bears. Take them out of the equation and it's much simpler.
I agree, I would like to use the same exception and go with a 7x57 mm. If I am forced to hunt big bears with my selection, I have no problem taken a poke at one with a 175 grain Nosler PT. (My backup would be a gun bearer with a "big" 06 - 35 Whelen.)