Milan Rifle Club Inc
This is one of the best gun clubs in the Midwest.
Be aware, however, that this is a private club and unless there is an event open to the public you must be a member or guest to use the facilities.
They have many activities including cowboy shoots (rifle,pistol shotgun), smallbore rifle, highpower rifle, bullseye pistol, IPSC (pistol), PPC (pistol) and a junior program for young people to learn safety and marksmanship (smallbore rifle,air rifle).
I believe most of the events are open to the public but the phone number just rings their indoor range which isn't normally manned.
Use the website if you need information, but they are not always quick to reply.