Yes they do have a bison hunt--however it is very limited and only 10% of the tags go to non-residents..I have posted the website for the Montana Fish and Game Department that will give you quite a bit of info and probably answer many of your questions..

http://fwp.mt.gov/default.html

As for Bison---There are also large ranches..fenced..but, in a large area you can hunt them in as well...the one ranch I am thinking of is about 110,000 acres...

In regards to elk and bear--all of that hunting would be free range--NO FENCES---either privatly owned land leased by the outfitter or some combination of land in how it is owned...as to the opportunity to get a bear--there are lots of bears here --and people shoot them every year during elk season..we also have a Spring Bear hunt which many of us take part in --in Fact it opens here shortly--hear some grizzly are out in the park.. while we can't hunt grizzly here in Montana, yet...they are waking up...

I will forward to you some addresses of some places I would recommend...have known them for a long time...lots of good references...and been in business for a long time as well...

If you come for elk hunting..be in shape---lots of steep mountains...elk hunting is very challenging..and most are not prepared to do what it takes to get the job done...

Take care

Ripp