Okay, this question has probably been asked a hundred times already but here it is again.
What caliber(s) will take down everything I could hunt in North America out to say 400yds?

Background: I have a Marlin 30-30 that I use forwhitetail 150 yds or less. But I'm looking for something to make some longer shots if needed and I want that rifle to take care of (most) everything.
Suggestions?