I can get mine to run at 325- 350 in the spring- summer- fall. I use playsand in the water pan, open all of the vents and put a small chip of wood under the lip if the dome.
Makes GREAT chicken!
"Primitive summertime rite at which spirits are present, hunks of meat are sacrificed by being burnt on braziers by sauce-smeared men wearing old hats and aprons with cabalistic slogans, and human flesh is offered to insects." --Henry Beard