RE: .270WSM..140gr or 150gr for whitetails???
You really need to try balistic tips at the range and see if your gun even likes them.
The coating on them, ( moly) or (lubabond) makes some guns not like them very well. my gun could not group with balitic tips at all. As suggested earlier I too would go for the 130 gr. bullets for whitail deer, in Federal or Hornady factory ammo. I'm not crazy about balistic tips.