Hey Jim, google terminal ballistic research and go to Nathan Fosters website ... this kiwi has done field research on almost every well known caliber and his evaluation of projectiles for the 338 cal's is a must read!
Click on "cartridge research" and there is also "wound research" . I'm in the process of finding a alround projectile for my 338WM and his webpage was extremely helpfull. In his Forum under "rifles general discussion" there has been a resent post on 250AB in 338WM