They have a good outdoor range, but it is pistol calibers only.
If you want to shoot a rifle caliber, you have to drive to a DNR range (Atterbury or Wilbur Wright) or a private gun club, or find a member with a personal range.
Actually, Fall Creek Valley, just east of Pendleton would be a good choice. I can't remember the annaul dues, soemthing like $50, maybe? It's about a 25 minute drive from Castleton.