I believe the entry posted is for William Duggan per Atlas 1819. Thomas Turnbull was also on that ship.
What religion was your William? RC or Protestant?
Peter, I don’t think we differ too much. I was a little slack by working from memory. Apologies.
Complete listing courtesy of NSW Archives:-
B.C. for Born in the Colony.
C.F. for Came Free.
F.S. for Free by Servitude.
A.P. for Holding an Absolute Pardon.
C.P. for Holding a Ticket of Leave. (I also see TL)
C. for Convict.
C.S. for Colonial Sentence.
G.S. for Government (or Assigned) Servant.