those settings look pretty good. Using another rule of thumb - Looney 11, your ISO for that speed should be 500 for a decent moon exposure shot. That doesnt sound too bad but f/11, 1/250 sec and ISO 250 sounds a bit better, you'll get a chance to experiment and see what works for you. Shooting the moon isnt too hard, you can even handhold something as long as 600mm to take a shot and get away with it. My brother
eliasfta shot the moon last week on a 200-600 lens, lets see if we can get him to post his shot here