Originally Posted by Mr. Bo
Charcoal basket is 17" diameter and 12" tall. It just barely clears the rack hangers and thermometer tip.
If your therm tip is that far on the outside of the drum, it's not reading actual temps at center of cooking grate. you could be reading as much as 50 degrees too low. But still, even then only being able to get up to 260 with all intakes open doesn't seem right.