Building a artillery tank with with a fixed barre l(TurretYawMin 180, TurretYawMax 180) is not possible.
When the angle is smaller than 40° (TurretYawMin 160, TurretYawMax 200) the gun firing pattern is wired, the shells are going in wrong directions or refuse to fire.

The whole turret firing system is broken and needs rewriting from scratch. Hopefully I'll get around to doing it one day.

Lots of things have changed, please let me know if this is still an issue for you.