Cooked at 250 for almost 1 hr 45 min. Seasoned it with rocky Mountain prime rib seasoning. Was little much pepper but good for me not the wife. Used my WSM which this is my 3rd time using it and held temp awesome. Took it off at 160 when I got home. I read all these posts about it taking 2 hours at 275 so I wasn't worried about over cooking it but at 240 it was done when we got home. I let it rest for 20 minutes while the fries cooked in the oven. Next time I'll make sure to plan this for when we don't have to go anywhere. Enjoy the pics. I loved the smoke ring it got from the hickory. Will make good cold Sammie tomorrow. Very tender piece of meat. Next time I'll guarantee it will be off at 130.