Originally Posted by WildRose
You leave out a very important part of the equaition which is, realistically what are the maximum ranges you are planning to shoot?
If it's sub 600yards then go with a 300wsm in something like the winchester coyote outback.
If 1,000yds is in fact reasonable for you then you need to stick with something like the Rum and the Sendero platform.
If you want to eek out every fps and have the best combination of precision, range, and FPS/Energy then you need the big case, lots of powder, and enough barrel length and weight to take advantage of it.
300 WBY (even at 24") and 300 RUM are both capable at 1k and beyond.
The Sub-Moa WBY and Sendero are both capable as well.
Sendero has a slight edge in both categories, but not a huge difference.
I'd be looking at the 230 Berger OTM, or 225 Hornady BTHP. But, the 210 VLD or 208 AMAX are popular as well. ...and, H1000 or Retumbo. Jeff (Broz) has posted impressive results with the 230 OTM's out of 300WM and RUM.
Either rifle can succeed. The key will be the supporting gear (e.g. optics, LRF, wind/weather, ballistics calc), and ultimately one's practice/dedication to the objective.