[Joseph Jostar]

The elemental atk scaling part isn't 100% necessary to the suggestion, it's just some thought for making those stats meaningful to a gunner or not. With just the 100% weapon scaling split between the element and the rest of the attack a gun attack would do maybe 20 less damage base (at the very MOST), in return for being far more effective against the elemental weakness.

The non-elemental shells would still use the regular gun scaling only, and Null Shell would probably keep shell power like it is if you want to just have sheer extra damage in your shots.