Ron,
By chance, do any of your ancestor's letters pertain to the Gettysburg battle (July 1863) ? I am seeking such material for my next book - "Georgia At Gettysburg".
What specifically do you want to know about the 3rd GA Battn. Sharpshooters? I know they were formed about May 1863 & one report has them involved at Chancellorsville. They were at Gettysburg. The command was composed of the best marksmen from the regiments belonging to Phillips Legion.
Sincerely,
Greg C. White
author, "A History of the 31st Georgia Volunteer Infantry",
(Butternut And Blue, Baltimore, 1997)