How about the reports of the 7th, have you looked there? I have not viewed these reports myself so I have no idea who may be listed, but jit may be worth a shot.
On another note if by any chnce you come across any burial information of Pvt. RichardB. Pittman, of the 7th Miss., who also was KIA at Chickamauga, please let me know. We have never found where he may be buried and he is not on any list for the Marietta Cemetery.