Every gun has it's optimal range to kill an elk. The farther you want to shoot the bigger the caliber should be to stay in this optimal range. Everyone has made the "great" shot, but when I see someone shooting a 6.5 Creedmore at a Bull at 950 yds it makes me cringe. 270's have killed more elk than any gun over time, but not at 400 - 500 yds. Shot placement kills not caliber but if you plan on shooting over 400 yds you should up gun in most cases. Although it is always best to shoot what you shoot best not just pick the bigger caliber.
i think there is some truth to this, but also missing factors..... i think lots of people these days are willing to shoot further (often a lot) than they are qualified to shoot at animals. i think people buy a big magnum and that gives them the ability to shoot further, in reality, it doesn't, and likely goes the other direction, they should be shooting closer since they are afraid of their new long range killer.
there are not a ton of guys qualified to take shots over 500yds, but the guys who truly are, and put in the time behind the rifle to do it, are generally those guys who can handle the bigger cartridges well. use a rifle you aren't afraid of, and stay within your realistic means, and only take shots you are qualified to take, and you don't need that magnum just in case you make a bad shot......
everyone thinks they are sniper status these days, they buy a rifle that's capable of shooting really well way out there and they seem to assume that rifles potential will magically rub off on them, when in reality, they will see no difference in their actual groups, because they are the weakest link, not the rifle, not the cartridge.
i can think of 3 people off of the top of my head who are not good shots at all..... pretty bad actually, and they bought rifle/scope combos in the last 6 months that are geared towards long range shooting/hunting..... if you miss the whole animal at 150yds with a dialed in Tikka, i would probably hold off on a long range rig, haha.
people are always looking to buy something that will "make them better" it just doesn't work, and that's why i think the "you need a big magnum cartridge for elk" is BS. there has been some great info in this thread, but much of it is dismissed because people can't see the facts, they bought into a belief system at some point and ignored some realities. if people understood and accepted their limitations, none of this matters.....
i think a big magnum in the right hands is a great tool for killing elk, but from what i have seen is most aren't good enough to benefit from them at all, and they suck at shooting them. you certainly don't need a magnum to kill elk very handily at the ranges 90% of the people should be shooting.... wasted gun powder for most