What is yours? I did a brisket that finished yesterday. 12 lber from Smart and Final with a nice even fat cap and the thickness of the flat was even too. 225-250 on an overnighter Fat Side DOWN went for 14 hours. 185 internal took out and put in a cooler for 3 hours. Unbelievable and may have been the best brisket No it definitely was the best I have ever done. Now I am wondering if I could have pulled it off at 180 degrees. Would 5 degrees less make a difference? Or do you check for doneness with a toothpick poked in the flat?