Imho a 257 and 6.5 bullet are almost identical. 6.5 have been killing big animals for a long time. I think the hardest idea to accept is a 223 can kill an elk at distance. 3 years ago I would have said, not ethical. Now it’s probably ok. I still won’t be doing it, but I would use a 6mm or 25 cal.Ever hear of the 250 Savage? Developed in 1915. People used to kill truckloads of elk with them using standard cup and core lead bullets. This is not a new argument.