T-Que, I posted about a week ago of one I did while I was in a fowl mood while NOT being in Atlanta for Eggtoberfest. Have a look at the link belowI usually do 12-14 lb birds, but you can do a 20 lb but you have to be a little careful not to get the dome thermometer stuck in your bird. (if you do indirect cook, which btw, you should do) The BGE website has some turkey sizes posted too.