30.06 has killed every type of game on the face of the earth and is plenty adequate for Elk. If you wanted to buy a gun exclusively for Elk then maybe a 300 mag or something bigger would make sense if you wanted to go a little above and beyond for good measure, but buying a gun chambered for more than a 30.06 when you already have one (or one categorically similar) to go on an occasional Elk hunt doesn't make sense to me. Even if you're loaded with $$ and like guns, getting a bigger gun will require a considerable amount of practice to become comfortable and proficient with it and you might get a sore shoulder doing that when you could just simply run a few shots through the 30.06 or 308 that you already have just before the hunt to make sure your still on. New guns need good scopes with careful and proper mounting, bore sighting and then a good amount of expensive ammo to get it sighted in. I don't know about you, but I can't afford the time,work, and money for a gun for every different animal and type of hunt. I don't think there's much you can't do with a good versatile 12 gauge (with a few barrels), a good standard high power rifle like a 30.06, 270 or 308, and a good 22 rifle. I think you can do pretty much all the hunting you need to do here in the lower 48 with those three. I' don't doubt that are hunters that have a large battery of well scoped and sighted rifles for a variety of purposes, but it's not always as easy as it might seem. I'll go a step further and say that the paperwork, taxes, and NICS checks and fees aren't worth the hassle to me if it's not an absolute must. Last time I bought guns for my sons and I, it seemed like a closing on a house with all the paper work and riggormerole that I had to go through.