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Taking a long shot here I would say you have a 4.5 in Naval "Drill" round dressed up as an HE, the case appears to be new as it bears a Naval "Unified" threaded Electric primer.
The fuze and the projectile are probably a lot older and I am guessing that the filling is "Lead shot".
Perjaps you could let us have a few pictures of the shell body ie driving band and general shape.