My own 257 has yet to be carried on a hunt. I have too many rifles! I built it because I always kind of wanted one. The barrel, a gain twist which ends at 1 in 12, wasn't ideal but it was there so I contoured it to a slightly skinny #2 (.520 at the muzzle at 24") and put it on the FN action. I re-worked the ugly stock and added a half inch to the length of pull. I was not surprised when it shot 100 gr Hornady bullets into 3/4 moa but I was a bit surprised when it did the same with 120gr Speer spitzers. The rifle weighs just under 7 1/2 pounds, ready to hunt, and carries pretty well. I think my ideal bullet for this one will be the 100 gr Nosler Partition.
Like most cartridges, the 257 Roberts doesn't do anything a bunch of others won't do as well but it has class. GD