I used to hunt the area around Chadron a lot when I went to school up there. That was where I started big game hunting, and I started with the muzzle loader. There are plenty of deer up there in the state park area, both muleys and whiteys. You should have pretty good luck if you put in the time. We always had good luck knocking on doors and asking permission as well. Nice people up there, so don't be afraid to ask. The worst that can happen is that they can say no, and you say thanks anyway and move on. Best of luck to you!