Unfortunately the civil war bullet book by McKee-&-Mason misidentified that bullet as an Italian Garibaldi or Carcano. Jim and dean Thomas have done excellent archival research of Confederate Ordnance Department documents, which proved your bullet was manufactured in North Carolina. It is known to have been used mainly by North Carolina CS uits, particularly the 6th NC Infantry Regiment. It was made in .54, .58, and .69-caliber.
In the Confederate Ordnance Department's bullet-production records, it was manufactured at the North Carolina Institute for the Deaf, Dumb, and Blind, and it was called the "Raleigh Pattern" minie bullet.