I don't use a thermo I poke briskets with my finger if it feel like a MED Well steak at 300 this is 4-5 hrs, I roll it in BP and continue to go until it probes tender usually 2-3 hrs later.
Butts when I see pull back on the bone I know it is getting close and I poke it with my finger to see if it is getting loose. When the bone wiggles freely while twisting, it's done.
I never met a Cow that I didn't like with a little Salt & Pepper! Certified PORK-A-HOLIC