I must have missed the earlier entry re a diary for the Palmetto Sharpshooters. One which is very helpful is James J. Smith, "Starved at Pint Lookout: The Diary of J. J. Smith (York County". This is a 79 page typescript and the only copy of which I am aware is located in the South Carolina Room, York County Library, Rock Hill. Smith apparently wrote 4 volumes, but only the volume which extends from October 1863 into the spring of 1864 has surfaced.
Another excellent primary source for the Palmetto Sharpshooters is a little book of letters written by a lieutenat in thr ergiment to his mother. It is Richard Lewis, Camp Life of a Confederate Boy of Bratton's Brigade, Longstreet's Corps, C.S.A.: Letters Written by Lieut. Richard Lewis of Walker's Regiment to his Mother During the War. Facts and Inspirations of Camp Life, marches, &c. Originally published by the Charleston News and Courier Book Presses in 1883, it was reprinted by Butternut Prtess in Gaithersburg, Md, twenty or so years ago.