I live in Central MT. So I can be of service with some general information. check out the MT FWP page regarding regulations.
http://fwp.mt.gov/ They MAY still send out the various rules manuals, but if not, drop me a name and address and I will forward one.
One needs to APPLY for your out of state tags early in the Spring. They are then DRAWN by a computer and if you are not drawn you build a preference point. Usually within a few years you will get drawn. If You have a buddy or two also going...apply as a PARTY. Enhances your chances..if one gets drawn...You ALL get a tag.
As far as the Back Country stuff....Adding horses, mules and tents into the formula adds expense, as well as opportunities for disaster. I'm not a big fan of horses or mules I prefer my own two feet on private Ranch property. NOT going to debate the back country experience, but I can surely help you with anything related to MT.
FN in MT