While alot of elk have been killed with a 22 magnum, does it make it a elk caliber? Methinks not. The elk I've killed and seen killed with a 243 were taken under "optimum" conditions, if there is a such thing? Do you need a 338 to kill elk? Don't recall that quote, but I were a SERIOUS elk or bear hunter, which I am niether, I would pack a 340 Weatherby, stoked with 225 Noslers or Hornady's. That is my opinion, can you kill elk and bear with a 257? Hell yes, Roy Weatherby killed the big 5 with a 257, does that make it a safari gun? I think most PH's would laugh you outta camp if a guy showed up with a 257 to persue the "Big 5". So yes, bear hunter, a 257 Roy will kill anything that walks, is the perfect elk and bear caliber? No, I THINK a 338 or 340 is much better suited to these critters.Once again, in my opinion...