I carried one for a while. My load was a 120 grain partition over 43 grains of H414, federal 215 primers, in WW +P brass.
I spent about 2 hours waiting for friends to try to push a bull they thought they'd wounded out of a brushed up clearcut. I had the width of a skinny graveled road to (a) see the elk, (b) react, (c) get the gun lined up, (d) fire an aimed shot, and (e) put it on the ground 'cause if it got across it would be over a steep bank and into 3 miles of brush.
At that point I decided my .257 wasn't gun enough for the job it was called to do. The elk exited the other way. No blood was found. All good. And by the next year I was carrying a .300 win mag which I shot my own first elk with.
Nothin' wrong with a .257 Roberts for elk unless something goes wrong. It doesn't have the snot to do mop-up.
Tom
