I do not have literally ANY experience with either the 150 SMKs or the 147 ELD-Ms yet. I am working on a 6.5 x 284 at the moment. It may be that in L/R BenchRest the "faster" 6.5s don't quite stack up, however, in F-Open they excel. I realize we are talking apples and oranges>>> but every person on this thread will be shooting one or the other and will have to make up their minds based on their specific discipline. I am VERY hopeful that these and the upcoming Berger 6.5 will prove to be as accurate as the 140 class. I, for one, would like to gravitate away from the BIG 7s..No. IF the 150s prove to be as accurate as a 284 with 180s it will be a good deal. You will have less recoil for equal ballistics. Barrel life will be a little shorter. We will see what kind of accuracy they will provide. The problem with the 6.5 in my experience which seems to mirror others I have spoke with is that the larger ones 260ai and up seem to get erratic. They dont agg well. The 6.5x47 will but there is no ballistic gain over a dasher at that point.