My first open/unrestricted FAC allowed me to use a .22 rifle at sea, but if the cliffs were less than a certain height(2-300 feet, I think), I could only shoot out to sea if I was within a mile of the shore. That was in the days when the Southern Sea Fisheries Committee issued Shag permits, and paid a bounty of 7/6 for each pair of Shag's feet.