Too many to choose from.
160 TTSX would be Da bomb.
One of my fav 338-06 bullets. Not sure my first choice for elk, but would probably not bounce off.
Very accurate in my gun.
DF
The 160 TTSX does quite a number on elk. ...and Kudu, and Gemsbok, and Waterbuck. etc. If you want a very really big wound channel from a 338 bullet, the 160 is a great choice.