http://www.bbq-brethren.com/forum/showthread.php?t=97552&highlight=prime+rib
here is what I did at Christmas. It worked good for us...
When you let it rest before putting it in the 500 degree oven where was it resting. As in did you wrap it up and put it in a cooler?
When you put it back in the oven to bring it back up to temp, do you pull it out and carve it up, or do you pull it out and let it rest again for 30 minutes and then carve it up?