Talk:Cannon/@comment-26391992-20150922161444/@comment-162.25.24.153-20160331101109
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Frigging huge. :)
If you are inclined you could messure it from a screen, if you know how big the ship is (and these mesurements are known) then just messure the diameter of the gun and you have the caliber.
But just going from the weight, and ignoring that there are probably more advanced lightweight materials in the Elite universe, it would be something between an 8 inch or 9 inch gun, so 203-230mm caliber. Which seems quite resonable with the size of the ships.