Hood's 4-inch ammunition was distributed around the ship

Were HMS Hood's 4-inch anti-aircraft cartridges stored deep forward below the main magazines?

Not as one simple store; the ammunition was distributed among several magazines around the ship.

Hood's 4-inch rounds were stored in multiple magazines rather than one simple location. The number of shells and guns makes distribution around the ship the practical arrangement. Detailed plans and discussion are available through the HMS Hood Association. Warship plans should therefore be read as a network of ammunition supply points rather than a single magazine label.