If you use the rifle correctly in the first place there should be no need for a backup.
And while a big bore rifle can be more comforting to carry into the pucker brush and a little quicker at putting a wounded animal down, it doesn't mean they are a better tool for every hunter.
The 30-06 was the most common caliber used by Alaskan guides well after the 375 became available, even Hosea Sarber, the legendary Alaskan territorial warden and bear hunter preferred his 30-06 ( and sometimes even his .270) over his 375 H&H when stalking bears due to the fact that it handled quicker and he had absolute faith in it. And there are still Alaskan bear guides who feel the same.
Bore size is not a substitute for bullet placement and energy is no substitute for bullet performance.
