Judith Mountain Meats (Charles) is the guy I used when I lived in Lewistown. They have this "sweet" flavor jerky that works for some reason.
Also a Hutterite Colony on the way to Grass Range does a good job. I think it's Stahl Meats. They had a pile of different sausage & pepperoni stick styles. I had them also do a whitetail European skull that turned out great.
Stahls Meats has done a great job for us in the past. They process every Monday/Wed/Fri. Richard is a fun guy to talk to. They are east of Lewistown and will be on the North side of the road a couple miles before Grass Range. Good luck
Stahls meat processors are they way to go. They had my muley done in a few days and everything was packaged/labeled great. Got a bunch of pepperoni sticks and they are awesome.... (I could have gotten the whole deer done in just sticks!). Worth a try!