What do you mean you will lose a lot of land to hunt on if you press the issue?
If there is no benefit to you to try to reconcile the issue (i.e. you get to hunt on private land also, or it simply keeps you in good standing with the local community), then simply go about your business of hunting the public land that you can legally access as you see fit. It's a control thing, and it doesn't hurt you to ask/tell them, but you're not obligated to either. I'd be darned sure if you go this route that you dot your i's and cross your t's with respect to access roads, property boundaries, etc. If the ranch hand gives you grief and is harassing you while hunting then you should report him for hunter harassmnent. Montana's law is very similar to Washington's in that they are both very good laws for protecting the hunter. You may want to take a camera that has video taping capability in case he does something really bizarre that would look good in court.
The state land board will not help you much in this situation. Also, the county commisionners can easily abandon the public road(s) in question, so you have to weigh your battles carefully. What county is this in? PM me if you want with that info.