Also, those bullets JOC mentioned were shot at velocities that are perfect for cup and core style bullets.
I always thought the idea behind the Barnes X bullets was to lighten up and drive them hard. If you are keeping your ranges on elk reasonable, maybe less than 500 yds or so, I would try the 185. I have had good penetration on small deer at 338 Fed velocities, and I doubt it will lose much weight when it hits an animal.
