Vital Strike and Double-Barreled Firearms

[Eigengrau]

It seems to me that rules under the double-barreled firearms say that both barrels can be fired using the same attack, so does this allow you to use Vital Strike with firing both those barrels?

What is the damage output using Vital Strike on a firearm dealing 1d12 damage per barrel, but using both barrels? Is it 4d12 or 2d12+1d12?

[Michael Sayre]

Eigengrau wrote:

It seems to me that rules under the double-barreled firearms say that both barrels can be fired using the same attack, so does this allow you to use Vital Strike with firing both those barrels?

What is the damage output using Vital Strike on a firearm dealing 1d12 damage per barrel, but using both barrels? Is it 4d12 or 2d12+1d12?

Double-barreled firearms have always been a little troublesome; I believe that a strict RAW means it's 4d12 since they're fired with the same attack, but given that each barrel requires a separate attack roll, it should probably be 2d12+1d12.