This regiment was formed in April of 1862 with approx. 1,100 members. Crute gives the total number of enrollments at 1,650, indicating that approx. 500 joined later during the war. Crute states that the Palmetto Sharp Shooters were formed from the 2nd, 5th, and 9th Infantry Regiments.
http://www.researchonline.net/sccw/unit170.htm
Clarence Robertson/Robinson enlisted as a Private in Daniel's Company L, South Carolina Palmetto SharpShooters March 10, 1862 at Pendleton, South Carolina, killed June 30, 1862 in (the seven-days battles before Richmond, Va.,) June 27 and 30, 1862
Company L, Confederate Guards, Anderson County
http://freepages.genealogy.rootsweb.ancestry.com/~york/PSS/L.htm
White Oak Swamp, Va., 30 June 1862 (Glendale, Charles City or New Market Crossroads, Nelson's of Frayer's Farm, or Turkey Bend.) One of the Seven Days' Battles of the Peninsular Campaign.
See: http://batsonsm.tripod.com/b/reg1ps.html
http://home.freeuk.com/palmetto/historypss.htm