The best replacement for .270 is .308.

The best alternatives to .270 are rated as following:
★★★★★  .308
★★★★  7mm
★★★  .243
★★  .280
★★  .223
★★  7mm-08
★★  .30-06
★  .270 wsm
★  .308 ballistics
★  6.8
★  .300 win mag
★  .30 06
★  .300
  7.62x54r
  7 mm
  .260
  6.8mm
  6.8 spc
  .306
  7mm 08

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

Other search terms related to .270 and their ratings are:
★★★★★ accutrigger
You have in mind a companion for .270 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of .270 in all years. Click on graph for more.
.270
.308
7mm