05-18-2018, 01:52 PM
I make the sprue plates from cold-rolled steel. With my set-up, I use 1.5, 2, 2.5... up to 4 inch mold blocks. These blocks are made up in batches. Like today, I'll grab a set of blocks that have most of the machining done. With a small caliber bullet like this one, 3 cavities go well into a 2 inch block. I'll cut the cavities using a chucking reamer that has the shape of the bullet ground into it (a cherry) then make the sprue plate. Then its on to testing and tweaking if necessary.