If you want lightweight, and a .338 bullet through an elk at 400, the 338 Fed will likely do that fine with the 160, 185 TTSX or 180 AB as examples.
Lots of truth in this ^ I hunted with the Federal round since it first came out in 06 or thereabouts. Got rid of it last year when I picked up the RCM on a whim. IMO the 338 Federal is one of the best rounds to come along in recent history. I took a big bison with mine at 300 yards so I know it will take elk. I've never liked the WSMs, none that I've owned fed worth a hoot. The RCMs are much better in that respect.
