I guess the deeper question here is the suitability of 30-06 for elk. I am guessing the increased diameter of the other 2 makes little to no difference. I read an article recently on Elk hunting, and I forget who the author was. He mentioned a quartering away elk at 300 yards, and the need for a bigger cartridge to punch through, esp if its stomach is full. He did not outright say it, but he thought a 338 win mag was a good place to start, and that an 06 is marginal. Got me thinking, but methinks he may be slightly overfilled with ummmm organic fertilizer.

......the occasional hunter wielding a hopelessly inaccurate rifle, living by the fantastical rule that this cartridge can deliver the goods, regardless of shot placement or rifle accuracy. The correct term for this is minute of ego.