I traded for some 270 bullets and I acquired some 130 and 140 grain Partitions. I have been a big fan of 150 grain bullets in the 270 in the past but can't really say a 130 or 140 grain Partition would do any differently than a 150. It seems odd that there would be three very similar bullets made in one caliber 10 grains apart in weight. I can say the 130 grain Partition will out penetrate either the Speer or Hornady 150 grain spitzers and spire points which I have used to good effect on Elk, Mule deer and Whitetails. The next hunt this rifle will go on will be for Mule deer in an area well known for being windy and open.
All depends on what you want from the bullet. For example, if what you want with an expanding bullet is primarily penetration for mid size game animal hunting (antelope, deer, sheep, and so on), then the 130 grainer is fine. But if you want the most penetration on moose and elk size animals, then step up to the 150 grainer (.279 SD). The 140 grainer works well, too (.261 SD), but the 150 is king. The said, a 130-140 monolithic bullet should be more than plenty for moose and elk (it will out-penetrate the Partition).
I personally would choose a 150-grain controlled expanding bullet such as the 150-grain Partition or Accubond for everything.
