That will also be on all of the maps, I can go back and search my old posts on it if you want the actual code to reference. No using a natural backstop for target practice on DNR lands though, just in the HNF where firearms are allowed and outside the Deam Wilderness. Long guns on DNR property need to be secured in your vehicle unless it's hunting season with the proper permits. If an area is marked no guns no dogs "safe zone", I tended to avoid it so as not to push the issue, seemed like kind of a gray area if they were just long guns and hunting referenced; they're all well marked on the maps and with signage, not too much in the M-M but Yellowwood seemed like it had several more.
Morgan Monroe is a great place to hike and I've OC'ed around many DNR employees there without so much as a second glance so they seemed pretty used to it.