Terry I'm somewhat familiar with you ancestor John T. Sirmans. His name was and is misspelled on his tombstone at Chase.
I believe he was with old Company C of the 29th which subsequently became new Company G.
Was he from Berrien County, Georgia? Do you know how his name was spelled in the pre-war census reports?
My email address is on one of the threads in this post. Shoot me an email and give me your physical address and I'll send you a coin when they are ready.