RE: 270 or 280
I would take, and I did the 280 Remington. Having said that, the 270 Win. and the 280 Rem. are as close to one another as any two cartridges we have. The 280 Rem. has a slight advantage over the 270 Win. because heavier bullets are available. Federal has two 160 gr. loads, a Trophy Bonded Bear Claw and a Nosler AccuBond. Remington has a 165 gr. Core-Lokt and if you do hand load you can go with 175 gr. bullets.
Do yourself a favor and don't over look the 30-06. I'm not saying its better then the other two, but its pretty versatile !