I would use your current rifle in 270. Plenty for black bear and your future plans of moose & elk. Use 150 grain bullets. I would take the money & spend it on good glass. Like a new Leupold scope for the 270 or if you already have a good scope. Then I would go for a good set of bincos. Like a pair of Leica or Swaro's. CB

But if you set on a new rifle----I would go with the original 300 Win Mag.