When the chuck gets to 150F is it sliceable? And, also, for shredding, can you go either way, Braise or not to braise?
I wouldn't cook a chuck roast to 150 unless it was Sous Vide for 48+ hours. You can braise it, or BBQ with dry heat until it is tender. In those cases, don't worry about the internal temp - just cook till tender.
I just now seemed to remember that is you don't braise a chuck it will be too dry.
I'll go out and remove the water pan right now, Chucky is on 70F.
Nope, chuck has plenty of fat and connective tissue so it will stay moist.
Not sure what kind of smoker you are using, but having a water pan in the smoker is not the same as braising. With braising the meat is cooked IN the liquid.
If you are in a hurry, set the smoker at 275 till the IT is 155ish then l wrap it tight with double layer of foil then put back on at 295 till IT is 180 plus for slicing and 195+ for pulling. 3-4 hours total +\- for a 1.5 inch chuck. I’ve done it many a time this way!
You can also use a braising pan....be sure to boil the liquid before so it doesn’t cool the meat. Cover the braising pan with foil so no evaporation.
Wrapping will be the fastest cause it stops the evaporative cooking process immediately, braising is only slightly behind wrapping cause the open volume needs to get to equilibrium before the evaporative cooling process is halted.