Easiest way to get good cast ones might be to cast the investment wax in your bullet mold, then have somebody that is set up investment cast them. You can box up the wax castings and mail them off if nobody local is doing silver. Typically that would be a jeweler or dental technician.

If I remember right, the article was is Gun World, .....sometime in the '70's. Gonna have to look it up.

Easiest way is to silver plate some lead bullets. I had a friend do mine so I would be protected from werewolves.

Yes, you can do it.

Here are some suggestions based on my experience using roundball molds to cast big gold beads:

get your mold good and hot (preheat with a torch)

use something to keep the silver from soldering itself to the mold at these higher temps; you can use beeswax or smoke the mold, or use yellow ochre, wax has to be mostly (but not entirely) burned off so that it doesn't bubble in to the molten silver

don't use the sprue cutter, silver is a lot harder than lead, just pour in to the open cavity