Range of 15". Roll an Artillery dice for each Salamander. This is the number of hits that the target suffers. Hits are resolved at Strength 3, although they reduce the target's Armour save by -1. Note that Salamanders cannot stand & shoot, though they may move and shoot as normal.
On the roll of a Misfire, D3 of the Skink Handlers are removed as casualties, and the Salamander does not spout flames that Shooting phase - either the Salamander has eaten the Skinks or they have got in the way of its corrosive venom. If there are no Skinks left to be removed, the shot is just discounted.