Actually...
....I guess it depends on the calibre of the AA gun. With .50 cal/20 mm, I've found them to be borderline useless even on fishing vessels. However, once I acquired a Balao class and upgraded the AA mounts to 40 mm, its easy to sink fishing vessels.
Don't know how effective it would be on merchents - I suspect the ship would have to be really crippled and you would have to get pretty up close and personal to do thew job. Even then it would take awhile.
As an aside - does anybody find the Jap gunners to be a little TOO good? Even at 2500 - 3000 yds?
|