From my research it is a decent round. Capable of doing anything you need for hunting deer. There are better more efficient rounds out there however that can do alot better. However I have always had a weakness for the 25 CAl I just like it. It has always made sense to me. However this comes from me the one who owns a 257 WBY heh.
grandpa gave me my 1st deer rifle. a remington 760 in 257 rob. many moons ago. probably not the most accurate rifle i ever put my mits on but i truely believe in the cartridge. the 257 rob does serious work on deer and hogs and kills cleanly. lil tuff to find ammo but get with a local gunshop and ask them to keep a box or 2 of whatever your gun likes and you will be satisfied with it.