As far as I know, there isn't a mission that spawns capital ships in Gallic Space. Only the Order, Outcast, and Corsairs spawn NPC's Destroyers and Battleships. Liberty sometimes spawns NPC's Rogue Gunships as well.
You best bet to test your gun is to get a friend with a battleship as well and do a little simulation.
Perhaps you can even show your set-up on the forums - could help and give a general idea.:)
You best bet to test your gun is to get a friend with a battleship as well and do a little simulation.
in 2 days i havent see any GRN gallic space is sow empty
That should have given you a hint not to buy a Battleship out there. Mistakes happens.
Anyways:
Seeing that the GRN has 1/20 I would have fit mine as:
1 Mortar
2 Cerbs
5 Primaries
2 Missiles
8 Secondaries
2 Flaks
If I were to use a gun, I would use it on a sitting ship. So mortar could be your 360 firing arc gun