Light guns < 6 inch
Light Medium Guns = 6 inches (effectively, if there were any guns between 6 and 8 inches they would be here)
Medium Guns = 8 inches
Heavy guns > 8 inches
For the purpose of the game, the 11 inch guns on the Scharnhorsts are heavy guns. As much as I would have liked to make gun sizes and turret layouts a based on techs, it wouldn't have meshed very well with the overall research philosophy.
Light Medium Guns = 6 inches (effectively, if there were any guns between 6 and 8 inches they would be here)
Medium Guns = 8 inches
Heavy guns > 8 inches
For the purpose of the game, the 11 inch guns on the Scharnhorsts are heavy guns. As much as I would have liked to make gun sizes and turret layouts a based on techs, it wouldn't have meshed very well with the overall research philosophy.