A rotary 6-inch gun and ammunition handling

Would a hypothetical rotary 6-inch cannon use separate or cased ammunition?

The reply expects cased ammunition and immediately raises the difficulty of reloading it.

The follow-up asks whether a hypothetical rotary 6-inch cannon would retain separate ammunition components. The brief answer expects cased ammunition. That immediately prompts concern about reloading such large rounds. The exchange identifies ammunition handling as part of the idea without offering a workable design for the gun or feed mechanism.