"On a hunch, I turned the oven off after 40 minutes on the last hour of cooking. I'm really glad I did because the roast would have been more than well done if I hadn't. I don't know what happened, I followed the instructions to the letter. My roast was even a tad over 5 pounds! I checked my oven temp and it registered 378 degrees. Maybe my oven holds heat better than some? Anyway, I think it would have come out rare to medium rare if I hadn't done the last 40 minutes.
So, I'll try that next time and let you know!