How the simulation approximates a 13.5-inch gun

Should HMS Tiger use a smaller game gun to represent its 13.5-inch battery and weaker pre-Greenboy shells?

No current option is exact, but the game's 14-inch gun appears closer to the historical 13.5-inch weapon than the smaller alternative.

The question separates gun calibre from ammunition quality when translating a historical ship into a simulation. In UAD, the 14-inch weapon appears to behave more like the historical 13.5-inch gun than the smaller option does. A smaller nominal calibre would therefore not necessarily produce the more faithful ballistic result. A true 13.5-inch option would be preferable, especially because shell quality before the Greenboy programme introduces another variable that calibre alone cannot model.