Results for the complete set of single-peg English Solitaire reversals (where the initial state has a single hole, and the goal state has a single peg in the same position) can be found in [jefferson03]
Starting from the initial state:
XXX
XXX
XXXXXXX
XXXOXXX
XXXXXXX
XXX
XXX
The following dead-end state can be reached in 7 moves (again, see \cite{jefferson03}):
XXX
XOX
XXXXXXX
XOXOXOO
XXXXXXX
XOX
XOX