Search this forum, and you will find a few briskets recipes of mine.
Quick run down… This was a costco complete packer. 14lbs.
trim, slight coat of mustard, rub, smoke at 225 for about 5 hours ish.
When internal time hits about155, foil the brisket.
Then I increase the temp on the smoker to 275 ish
Cook it until its done.. tooth pick poke test…. Can can be at 198, or as high at 208, pending how tender the cow was.