Right now I'm smoking a butterball turkey with the little plastic temperature indicator that pops up when the turkey is done. I've also got my meat thermometer buried deeply in the breast of the turkey.
The bird weighs between 12 and 14 pounds and has been in my MES set between 225 and 250 for about 5 and 1/2 hours. At 30 minutes per pound, that puts the total cook time around 6 to 7 hours. My meat thermometer indicates 165 degrees and tells me its time to pull it out but the plastic pop-up hasn't popped up yet.
So, do I pull it now (based on my meat thermometer) or wait for the pop-up?