It's a dying chambering, indeed. But, if you have one, it's always going to be roughly the equivalent of the 6.5CM/.260Rem with medium-weight big game bullets. A deer or hog at typical hunting ranges is not going to recognize any difference between a 120gr load at 2,850fps from a Roberts and a 120-130gr load at a similar speed from a Creedmoor. Put the same quality bullet in both, and they are indistinguishable.
I think the Roberts "belongs" in a pretty walnut rifle like the Kimber Select, and not much will shrug off a 120gr Partition in the chest.
