Blast

This weapon fires in a cone that extends only to its first range increment. You can’t use it to attack creatures beyond that range. For each attack you make with a weapon with the blast special property, roll one attack against each target in the cone, starting with those closest to you.
Each attack takes a –2 penalty in addition to other penalties, such as the penalty to all attacks during a full attack. Roll damage only once for all targets. If you roll one or more critical hits, roll the extra critical damage only once (or any other special effects on a critical hit that require you to roll) and apply it to each creature against which you score a critical hit. You can’t avoid shooting at allies in the cone, nor can you shoot any creature more than once.
Attacks with blast weapons ignore concealment. A blast weapon doesn’t benefit from feats or abilities that increase the damage of a single attack (such as the operative’s trick attack). Ammunition for blast weapons is designed for blast attacks, so you spend the usage amount only once for each cone of attacks.