Back in the day when I was young and in my prime, using a bottom pour, I used a ball nosed end mill and milled a slot between the cavities on the sprue plate for my double cavity molds. So, instead of a countersunk hole for each cavity to pour melted lead through, I have the slot connecting the holes.
I think this is part of my problem preventing me from getting consistent quality when I used a ladle. Do any of you ladle casters have the holes on the sprue plate "connected."
Thanks,
Leon