Sounds like the Guernsey County Sportsmans club may be the place your looking for .
They have a 35 target 3D course .
They shoot once a month and 50 shooters would be a very low turnout .
The range is around 15 miles west of Cambridge .
I dont know if they can help you out or not , but the contact number is 740 - 874 - 5058 after 4:30 .
Hope that helps .
Scott