This advanced version of the blunderbuss shoots in a 30-foot cone when firing pellets, and has a 20-foot range increment when firing a bullet (often called a slug).
A shotgun uses metal cartridges (loaded with either a bullet or pellets) as ammunition.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.