I have decided to cast my own 12 ga slugs as buying them is taking more money and longer times to receive also I am shooting more slugs tha buckshot. I would like a recommendation for a good slug mold for a Mossberg 500 26" barrel with screw-in choke. I would like a 20" barrel with screw chokes but have not been fast enough to get one. It has 3" chamber but I use 2 3/4" shells.