A James Scofield appears in a list of soldiers etc sworn in as searchers at Castle Rushen in 1755 (in 1792 commissioners' report) - he does not however appear in the 1757 list of Castletown Householders.
If he was a soldier (under Duke of Atholl not British Army) then the Castle Rushen or Atholl papers in Manx Museum will probably have some additional info.