RE: 257 Roberts is VERY impressive!
I had a pretty long career with the 257 Roberts. I first reloaded it for a friend then later got one of my own. I also use the 250 Savage and now the 25-06. I used the 257 Weatherby for a few years as well. All the game that I harvested with the 257 Roberts was with the 100 Grain X bullet. It was like the bolt of lightning we hear about. I now just use the 250-3000 and the 25-06 to simplify my reloading chores.