RE: New Cartrige?
Without trying to sound like an ass, it really depends on what your idea of bigger is.
Just a couple of suggestions that "not everyone has", a 35 Whelen, 338 Federal or even a 338-06. You might want to check out the 270 WBY also but I'm not a big Weatherby fan.
Bottom line is that its hard to beat a 270 Winfor whitetail hunting.