I think you'd need to size down the cast bullets some, since the coating will add some diameter.
Why wouldn't gas checked cast bullets work just as well? Are we talking about a softer lead alloy? or what? I think a custom mould with all the bullet features you want (bore rider, crimp grove at the right location, spire point etc.) would be less trouble.
Getting a consistant coating is going to be hard.
My $.02
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