There is only one ORC (Ohio Revised Code) 9.68 which mentions Open Carry. That is the pre-exemption code. This is the only one I am aware of. Open Carry in Ohio is a constitutional right Article 1, Section 4.
You might try the Vandaila Range and Armory on National Rd in Vandaila. They have a really nice facility there and should be opening their new "100 YARD" indoor, underground rifle range soon.