Toolmanmarv,
I'm also located in the Nashville area, but I don't really know who would be qualified to give you an appraisal that would be acceptable to an insurance company for replacement cost
You might want to contact John Allen at Game Fair Ltd. on Post Road. He deals in really high quality firearms and might be able to steer you towards someone who can provide you with an appraisal. Here's a link to their website:
http://www.gamefairltd.com/
Good luck!
Dave in TN.