The pirates of the Vampire Coast carry a large assortment of black powder weapons, ranging from pistols to Great Cannon – not a normal sight in the retinues of more traditionally minded (and less clinically insane) Vampire Counts. Though Zombies are not normally known for their ability to shoot straight (or at all), Harkon long ago wove an enchantment that allows them to do just that. However, even the misused magics of the Slann have a hard time making soggy and waterlogged black powder weapons discharge with any reliability.
Source: Warhammer Fantasy: 6th Edition
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All black powder weapons that require a roll to hit will always hit on a roll of 6 if the firer has Ballistic Skill 0, regardless of any modifiers. However, any rolls of 1 will result in the gun misfiring – resolve the hit against the firing unit instead of the target.