There is not much to be said about the 257 Roberts. No it is not better than a 25-06. But it will do most anything that a 25-06 will do with less powder, less recoil, less noise. Hence a very light rifle like my conversion can be had in a 257R. In a converted Handi it is a danty.
It is about as good a deer rifle you can get using bullets up to 120gr. It kills moose too. Yes I agree a 257 Roberts by the factory would be a real welcome by a lot of Handi users, specially the young and tender folks.
My 257R has been plaqued by latch trouble again and I need to do a permanent welding job on the hinge seat. This loosening is driving me nuts. But then I been only working on it for two years. The troube is I shoot it too much with the 75gr V-max. The 6x47 and the 17HMR is better suited for varmints.
The 257R is easy to hand load and cases are easy to get. Besides you can make cases from 6mm Rem, 7x57, 270 win, 30-06, and 25-06. I had both 25-06 and 257Roberts in a Handi and I think the 257R is better suited to the Handi than the 25-06.
Though I really like a 25-06 , one of my most accurate hunting rifle is a Ruger#1 in 25-06. Its not getting much use with the 257 Roberts around.