Is this weapons OP?

So I've got an alchemist with the gunslinger dedication in my group, they've just employed an NPC gunsmith to work for them alongside gattlebee, I was thinking that giving him a gun to add some extra utility to his bombs would be cool, but didn't wanna break the game by making it too strong, here's what I've got so far;

Alchemists Scattergun

Rare Concussive Kickback Scatter 10ft

Hands 2 Reload 2 Bulk 1

This Scattergun functions with both conventional ammunition as well being able to be loaded with an alchemist's bombs.

When loaded with an alchemical bomb using 2 actions, the Scattergun fires the bombs effects into a cone, the size depends on the level of bomb loaded into the chamber. Targets in the area make a reflex save against your class DC. Potency runes will raise the DC for these bombs, but striking and property runes have no effect when using the gun to fire bombs.

Critical failure - the target takes double damage from the bomb Failure - The target is effected as if hit with the bomb Success - the target takes only any relevant splash damage Critical success - The target is unaffected.

Bomb - Cone size

Lesser - 10ft Moderate - 15ft Greater - 20ft

My thinking was that the extra actions spent to load the gun offsets the potential extra targets of the bombs? Thoughts?