RE: Still trying to decide...
I can't really see the reason for either the 270 wsm or the 280. Both are good calibers, but the cost of ammo and being able to find it if needed pushes them both to the back of the list.
The 270 Winchester will do anything those other two will, when hunting. Use 130 grain for varmints and small deer, 150 grain for large deer, elk, and black bear. At 300 yards and beyond, you the shooter is the most important factor, not the caliber of the rifle you're shooting. The 300 magnums are useless when shot at 300+ yards if the shooter shouldn't be shooting that far.