Apprx 9.5 lbs. a modified version of some internet rub recipe that we have been using for a while.
full firebox w/applewood chips
platesetter legs up
Stabilized at 250 degrees (dome - not sure of grate temp)
butt went on at 18:30 Friday
checked temps a couple of times over night - constant 250 dome
as of Sat 12:30pm (18 hrs later) internal temp still at 145 (since 07:30AM. I know there is a plateau, but 5.5hrs???)
at 13:00 removed platesetter and pushed charcoal to the back of the firebox and put the butt on the front of the grate jacked the dome to 325 or so.. and pulled it a 195 at 16:30. (22hrs)
Was still very moist and omGoodness!!! great flavor and melt-in-your-mouth tender. I am chalking this up to a disintegrating seal. (original 3.5yrs old). I did notice some smoke escaping around that seal on one side. I also seem to have better luck NOT using the PS. I still consider it a successful cook as it was DELICIOUS!!!