A .30 always has an edge over the 7mm caliber in all classes. That is, a .300 Win. Mag. (NOT WSM!!) is a better elk rifle than a 7mm Rem. Mag., a .30/'06 is a better elk rifle than a 7X57, a .308 is better than a 7mm/'08, etc. etc. However, this is not to say that the 7mm Rem. Mag, using the right bullets, is not sufficient for elk, because it is. If I shot more deer than elk, I'd opt for the 7mm Rem. Mag., and use it for both. If it is to be an "elk-only" rifle, then I'd get the .300 Win. Mag., or a .300 Weatherby!