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Big party this afternoon. I put a rather large shoulder (11lbs) in my MES 30 last night around 10:30. I woke up around 4 am and inserted the thermometer and in three different spots it was only 130-132 degrees. Is it destined for the trash?
One other problem you may face, since it's such a big shoulder, it may not be done in time for your party. If you need to rush it, definitely foil to speed up the process, and bump the temps. You can even finish in a higher temp oven if you're really pressed for time later on.