Just thought of something - silicone withstands 400 degrees for 20 minutes easily. In fact, the Sears PC gun comes with some silicone plugs for masking off holes.
Wonder if it would be too hard to make a silicone mold to hold boolits? A jig for certain ones for that matter. Wouldn't be conductive of course but you could spray them bottom's up, bake, then spray standing up on foil for a top coat afterwards. It'd make it a 2-step process but if you made a jig for standing them up it'd go a LOT faster. (That's usually the biggest pain.) They sell silicone mold making supplies at some craft stores.