First Question! What are you going to be hunting with this long range gun? I use my 30-06 Handi for wolves at 400 yards, would not want anything lighter. I use a 165gr boat-tail, or the 125gr Speer TNT.
I hope this lines up correctly.
Cartridge Type Bullet Muzzle 100 200 300 400 500
Premier AccuTip 130 ABT 2702 2335 2009 1721 1467 1243
Remington Express 125 PSP 2736 2145 1662 1269 953 706
But this compares the 30-06 125gr BTSP (bottom) with the 270 130gr BTSP As you can see the 270 fares quite a bit better with the lighter bullets than the '06 when you're talking 400-500yds.
(EDIT) these are ENERGY figures not velocity. The 270 still has 500fps over the '06 at 500yds.
The 165 gr '06 does slightly better than the 270 but not much. Point is there are many rounds suitable that are "lighter" than the '06, at least as far as a wolf goes.