I know a lady who shoots all her elk with a .243 Win. All monster bulls by the way. She is a rancher in good elk country and is one of those few who can pick her shots or hunt another day as Boddington keeps writing about. There was one epic failure that almost ended her husband existents when the shot placement or the bullet was bad. She knocked it down and all thinking it was dead her husband went up to the bull. The bull got up and charged her husband at close range. Luckily he was able to get a shot into its head before it could do the damage it was set on. No idea what caliber he used.