To me it doesn't make much sense that using a ships weapons requires a Ballistic Skill Test.
Shooting a personal weapon is a matter of hand eye co-ordination and similar related skills. But using ship weapons does not use those skills.
When a ship shoots isn't it more a matter of judgement, using the ships sensors to determine predict the targets location, and then choosing the right fire pattern with this information.
With this reasoning wouldn't a Challenging (+0) Scrutiny+Detection Test be more appropriate.
I look forward to hearing your thoughts.