Trim the pork butt’s fat cap, removing enough fat so rubs can penetrate but leaving some fat for flavor.
Preheat pellet grill or smoker to 250°F.
Coat pork butt with yellow mustard to help rubs stick.
Layer rubs evenly over the pork: first AB’s B Rub, then AB’s BBQ Rub, followed by AB’s Special Blend Rub, covering all sides.
Place pork butt fat side up on the grill grates. Smoke undisturbed for 4-5 hours.
At about 4.5 hours, spritz with a 50/50 mix of apple juice and water or vinegar if bark looks dry.
When internal temp reaches 165–170°F, wrap pork tightly in foil, butcher paper, or place in foil pan.
Continue smoking until internal temperature reaches 203°F or until thermometer slides in easily.
Rest wrapped pork for at least 1 hour.
Shred pork using forks or meat claws, mixing in any juices from the foil.
Serve pulled pork piled on buns with Southern Coleslaw and BBQ sauce if desired.