Ripon gun club is a good place to shoot, and the membership fee isn't that bad. If you want to shoot USPSA, IDPA, Cowboy, Trap, Sporting Clays, or 600 yard matches, they have them all, and you don't have to be a member to shoot matches.
Forest Sportsman's club, is about 10 miles East of Fond du Lac, and they have a cheap membership. They primarilary shoot trap & skeet, but, have a berm for pistol & rifle.
Izzak Walton, just outside of Fond Du Lac, is around $100 to join, but, usually doesn't have anybody there.They are talking about only allowing shooting when a range officer is present because some asshat was shooting through the buildings
Wescot Sportsmans club is just West of Fond du Lac, and primarilary a trap club, but, also has a berm for pistol and rifle.