Let me start off by saying that I am by no means an expert on elk. The only dead elk I've seen is the decent 5x5 I took home a few years back and the young 4x4 the guys camped next to us tagged. I have a lot of respect for these animals after seeing how tuff they are. Mine was dead on his feet after a 300 SMK punched a good sized hole through both lungs, and the dude never batted an eye till I hit him with a high shoulder shot to break his back. The other one was hit with three 140gr Accubonds from a .270 short mag and a 180gr Accubond from a .300 Mag at under 200 yards (all probably fatal) and it stood there looking at them and calmly meandered over the hill it was standing on till it expired. I voted for under 250 as well because there was no option of zero. Of course a properly place shot from a 25-06 will kill an elk, but after my experience (limited as it might be) I almost feel under gunned with my EDGE!
Maybe I'll get another chance to expand on my knowledge if I get to go this November. Hopefully be taking my son, the least he will be using is a 30-06 with 180gr Partitions.