As you can tell, you have stirred the biggest "opinion pot" in hunting - whichcaliber and/or rifle is best.So, here are some thoughts. The270, 280 Remington, 7-08, .308, and the 30-06 are all comperable - period. Each of them will achieve 3,000 fps with either 130 (270, 7-08) or 150 grain bullets, and the ballistics for each is close enoughthat neither you, nor the game you hunt,will be able to tell the difference out to400+/-yards.
The mags - 270WSMup throughall ofthe standard 300'sshoot between 200 and 400 fps faster assuming you are shooting identical bullets (i.e. - my 150 grain .308 = 3,000 fps vs my 145 grain 7 mag = 3,250 fps), but require 25 to 40 grains more powder which equals a lot more recoil, but also addsfunctional "cross hairs on meat" distances of about 100 yards.
Me, I own a .308, a 30-06, a 7 rem mag, and a 300 win mag. Ilove all of them,have killed several deer and hogs with each, and have made up to 400 + yard shots with each.I nowshoot the .308 with 150 grain hornady light mags 75% of the time out here in CA.(blacktail, hogs, muleys, black bear). I have retired the 30-06 and the 7 rem mag and carry the 300 as my second rifle.
I guess the point of my rant is - the 270 is as good as any, and better than a lot of them,for deer, black bear, hogs, etc. If you are hunting where you think you need morebullet weight for long range or large animals, or just want more punch, the 300is a great choice too!.It all comes down to you, your hunting area, and what makes you most comfortable when you pull the trigger.
Oh, and if you want to compare ballistics between bullets, or between different calibers, Hornady provides a very good free ballistics calculator which can be found here
http://www.hornady.com/ballistics/ballistics_calculator.php