In my book the 270 and 280 tread the ground in between the more ideal deer cartridges and the 30-06, their extra case volume provides ample propulsion for heavier 150gr and 160gr bullets which in my book is the entry level for larger then deer game. You can launch 156-160gr bullets in a 6.5mm, and they will kill a moose as has been proven many thousands of times before, but you are loosing alot of speed and you better be pretty darn close when you take your shot, like within 30-30 range.
The 7mm Ram Mag is a specialty long range cartridge only in my book, within real world hunting ranges it won't do anything a 30-06 won't do, you have to get out past 400 for the benefits to start to become apparent, because while the 7mm bullets have great BC the 30 cals are no slouch either. While their is something to be said for a long range hunting rifle those kinds of ranges are the rare exception and not the rule unless you live way out west. While the 7mm Rem Mag is a good performer at range my go to long range gun is a 270 WSM which I just like a lot better, more accurate then any of my 7mm Mags, lighter, more compact, and kicks a lot less.