I was to look at Japanese gun data in Japanese Cruisers of the Pacific War:
20in/45 (510mm)
- length of barrel: 77.3ft
- weight with breach: 227 tons
- AP shot: 4,299 lbs
- charge: 1,058 lbs
- twin turret weight: 2,780 tons
- date: 1940
18.1in/45 (460mm)
- length of barrel: 69.3ft
- weight with breach: 165.76 tons
- AP shot: 3218.75 lbs
- charge: 793.66 lbs
- triple turret weight: 2,565 tons
- date: 1934-1939
18.9in/45
- length of barrel: unknown
- weight with breach: 167 tons
- AP shot: 3,417.17 lbs
- charge: 751.78 lbs
- twin turret weight: 2,500 tons
- date: 1916
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