I've never cooked one that hot but I know a lot of folks here do them hot and fast.
Once it gets to aout 200 probe it for tenderness - if it gives any resistance let it go a little longer. When you pull it throw it in a cooler for a couple of hours if you can stand to.
Official Pennsylvania MOINK Ball maker
1 Large BGE - 7/5/08
1 Large BGE and table - 8/29/12
1 18.5 new to me WSM
Super Fast BLUE and RED Thermapen
1 - The Great Outdoors Smoker Sea Bug cooker
1 - Fantastic hubby - the original Big Al
Enjoy the little things, for one day you may look back and realize they were the big things. - Robert Brault