I find the Skullmasher exceedingly underwhelming when you're actually using it as a sniper rifle. The pellet spread on it is just atrocious and makes for little to no damage when used at a distance. Maybe a perfect Skullmasher with the accuracy accessory might remedy this problem seeing as it'd cut the pellet spread in half.
Anywho, my vote goes to the Volcano all day every day. It gets some outrageous damage when it procs on that 80% damage boost. And I love dual wielding Volcanoes with my Gunzerkerrrr.
Some doors are best left closed, because once open, they're easy to walk through again and again. -- GT: Wretched Owls