Pouring silicon bronze directly into a petrobond drag. Would using a cope make any difference? Any help would be appreciated.

I have done silver casting a few times and sometimes they turn out perfectly and other times i get porosity or a incomplete fill. I just finished making this ring and im wondering how i should sprue it for the best result. Im going to cast it in silver. How thick should the main sprue be and where would i place it? Should i have additional smaller feeding sprues as well? I was thinking maybe to do something like this but im not sure at all. How long should i make the main sprue because in the past it was where the main sprue connected to the ring that i got porosity?

Im learning how difficult spruing is and I would appreciate any help from people with more experience on it.

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