The Elk Population varies in Montana. We had a extended season in some areas because of not enough Elk taken, to having reduced tags issued in others. You can start your research yourself at http://fwp.state.mt.us/hunting/planahunt/ This gives harvest info on Elk and other species. Find an area that looks promising for what your after then try and find an outfitter that works that area.
Make sure you do your homework[X(] about the intended outfitter and get referances to avoid any problems with your hunt.
Good luck