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My understanding is that J3 is an AoN scheme with 480lb belt,bulkheads and barbettes. the deck is 160lb over vital and steering with over era being 80-120lb but turret roofs are 320lb.
I also expect the 15"/50 mk II (projected, never officially designated) to use the same shell as the 15"/42 mk II talk of a 2048lb shell seems to me to be a copy paste for the 16"/45 mk I 92.10.214.190 ( talk) 12:28, 4 January 2024 (UTC)