The gun you can shoot the best is the best. Other than the big bears (Brown/Grizzly) a 270/280 is excellent with little kick (therefore better shootability) compared to larger calibers especially mags. I also shoot a 257 Roberts and would use it for anything other than those big bears (Moose included). Lots of guys can shoot those big magnums...I'm not one of them. Most can't IMHO.

Accuracy kills!!!