Why quadruple turrets approach the practical barrel limit

Is there a practical limit to the number of naval guns in one turret?

Quadruple mounts are practical, while five or six barrels create complexity that outweighs their theoretical possibility.

There is no absolute geometric rule preventing a turret from carrying five or six guns. The practical design becomes much harder as barrels, recoil systems, ammunition paths, and working spaces multiply inside one rotating structure. Four guns remain workable, while quintuple and sextuple arrangements add needless difficulty. Naval architects can draw more barrels than a fleet can build, maintain, and fight reliably.