Making 12ga (almost) from hell brass - Reloading - Oz Gun Lobby

For a while now I have been toying around with making 3 1/4 in heavy brass shotgun shells. the end plan being able to seat full bore slugs over full cases of powder like regular centre fire ammo, only bigger! something along the lines of a 730 nitro. Yes I am aware shotguns are not meant to shoot rounds like that, but its part of a bigger plan that includes the heavy rifled barrel I have tucked away and a Greener GP. Anyway my plan consists of joining 12ga shell heads onto cut down 50bmg brass

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