As a rule I use a 225 o cook temp; bone-in or bone out. I always use a probe thermometer set in the thick of the meat. Once they hit 190 I hone in on the doneness. If they're bone-in, I tug on the blade bone. When it pulls out with a minimum of effort, it's done.
Boneless is a bit trickier. I'll insert the probe from my thermometer into the thickest part of the butt. If it slides in easily, I double check from top to middle, bottom to middle and side to side. When it slides in without resistance from 4 points; it's done.
As for the Carolina fellas...I'll leave that to them to chime in. You'll get 10 different answers from 10 different cookers
