The best replacement for 270 is 308.

The best alternatives to 270 are rated as following:
★★★★★  308
★★★★  7mm
★★★  270 wsm
★★★  30-06
★★★  243
★★  30 06
★★  270x
★★  25-06
★★  280
★  7mm-08
★  7mm rem mag
★  7mm mag
★  308 recoil
★  300
★  30
★  30-06 recoil
  06
  25 06
  30-30
  300 wsm
  660
  22-250
  308 ballistics
  30 cal
  7 mag
  7-08
  260
  6.8
  wsm
  270 short mag
  30 30
  300 win mag
  7850
  30 06 recoil
  223
  308 caliber
  25
  30-06 ballistics
  7mm 08
  .300 wsm
  6.5 swede
  30 ot 6
  6.8 spc
  .243 caliber
  243 rifle
  7mm08
  7mm mauser
  7mm rem
  .30 06
  atom 280
  30.06
  nikon 18 200
  308 rifle

Your alternative for 270 is not listed? Suggest!
Speaking about 270, one probably shouldn't forget about elk.

Other search terms related to 270 and their ratings are:
★★★★★ elk
★ h4350
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270
308
7mm