I was very shocked to see back on the first page of this thread, that somebody wrote a .243 with a 100 grain bullet at 250 yards as being the minimum. Its a proven fact that it takes a minimum 1500 ft./lbs. kinetic energy at the target, to take an elk. A .270 with a 150 grain bullet at 200 yards, barely produces 1500ft./lbs. of kinectic energy. Now, if you have been around elk as much as I have, you probably have developed that same great amount of respect for these magnificant animals, and you know just how hard they are to kill. So a .243 with a 100 grain bullet at 250 yards is not only flat out stupid, in my mind it is a slap in the face to the elk. Now I have seen elk taken with a .243, but these elk were stalked and shot within 25 yards.