There was also an RAF mod to one B-24D equivalent (a GR V?) with 4 x RPs braced off either side of the nose that was to have been used in anti-submarine attacks so, presumably, 25 lb AP warheads would have been used.......
Can't find the picture I know I have somewhere. Alan Blue's book 'The B-24 Liberator' (now there's an original title!) is full of dozens of B-24 mods, Brit and Yank.