Cut the bone away and cook separate from the roast. Pull the roast out at 135F and let sit a good 20 minutes. You can always put it back in for five minutes but you cannot undo a well done roast down to medium. Reheat the bones the next day with bbq sauce.
If you need to feed a lot of people, buy two or three smaller roasts rather than trying to get one roast properly cooked. Start at 450 for 15 minutes then lower to 350 until it reaches the internal temp tou desire.
You can simply continue cooking the roast until the internal temperature is 135 F for medium rare, 145 F for medium. You'll need an instant read thermometer to test the temp -- can be picked up at any kitchen store for less than $10. Hope this helps!
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