Well it would be a screamer, that's for sure. I thought about buying a 7mmRM & re-chambering to 7STW, but I am a little hesitant now. I use a very good gunsmith, one of the best I think, & he has done alot of Encore work. He tells me that the std. '06 head sizes do better in the Encore as far as target accuracy goes. I mean, you could by a 338 barrel to Elk hunt with & any group sizes under 1" would be a nice bonus, but in the 257 or 7STW, if you don't get extreme accuracy, then the extra power cannot be effectively utilized.
I am going to research this further, but right now I am looking at buying a 7-08 tube & re-chambering to 280AI.