You're welcome.
Have a look at the weapons in guns.sim with Silent 3ditor. There are quite a few, but the first entry in the stock game is for a 14-inch gun, and for GWX it is for a 381mm gun, IIRC. Expand the ammo_storage entries and have a look at the shell types to get a good idea of how big of an effect you want. Keep in mind that if you change the shell type of a flak cannon to one used by a larger naval gun (like a 16-inch, for example), your flak cannon will do the same amount of damage as that larger gun would.
If you open Shells.sim there are values for the tracer, water splash, and explosion effects, and also detonation effects. Where those values are actually pulled from is beyond my experience.
Couldn't hurt to ask around in the
SHIII Mods Workshop, too.
