Well, it's pretty straight forward in the title. I want to knowwhich round,300 win mag or the 7mm Rem mag, isbetter for deer and elk,or possibly even moose or carribou (I originally was looking for a grizzley round, but lets be honest,I'm probably never going to huntgrizzley.) Which one is better for...

clean kill,
flatter trajectory,
cheaper (not a big factor, but helps),
recoil (I probably should mention that the 300 win mag rifle I'm looking at only weighs 6 1/2 pounds)

And I'm left handed, and have narrowed down my choice to 2 discountinued Weatherby left handed bolt action rifles, so please don't suggest others, as these were hard enough to find.