I'm quite sure a .257 WBY will work for any elk just fine. I've killed 2 with a .243 (spikes 100 yds away) Anyway, get this, I was just reading the Pa. hunting regs. for our Elk hunts, If I'm understanding it right, They say a centerfire rifle with at least 27 cal. that propels a projectile 130 grs. or larger. Does that mean I can't use my .257 WBY. or someone else with a .264 Mag.??? but I could grab a 30-30 or .357 mag. lever action??? I'm not to worried though the drawing is only for a few animals anyway, just thought some of you folks would get a kick out of this