RE: Caribou - CPX2 or CPX3 sized game?
CXP2 - they are very much like deer in body structure and most use a deer type bullets when hunting Bou. Nosler Ballistic Tips, Gamekings, etc are very popular caribou and deer bullets. The new bonded bullets also seem to be gaining ground from the deer and up crowd -ie:Accubond. Since you referenced winchester (olin) classification maybe their new xp3 bulletin the elite lineup might be of interest? Supposed to be the best of both worlds, at least according to the winchester press releases and reports I have seen by rag writers.
Good luck