A good option for elk with a little extra stopping power is the 235 grain Banes X. If you reload your own the velocity range from 2700 to 2900 fps. With a 200 yard zero you have +1.7 inches at 100 yard -7.6inches and at 300 yard and only -24 inches at 400 yard.
The nice thing about the Barnes is that it acts like a solid after it opens up for deep penetration. If you are looking at getting through a skull of a grizzly it will do the job. When I was in Africa my PH said that he feels that the Barnes X will pentrate the skull of an elephant. A true solid would be the best but the X will do in a pinch. The down side of the Barnes is that you will have to be very careful that you don't have a second elk behind the first.
If you are looking fora source of commercial ammunition available you can check out the different bullet weights for .375 H&H at
http://www.cpcartridge.com/375H&HMAG-B.htm