Received it today, scrubbed up, heat cycled, smoked with matches and got good casts within a couple pours. Did a mix of the various pins, I need to smoke the hollow base ones and try them again. The first pours on those permanently stuck on the pins and I had to remove and melt them off.
200, 240, 300 gr casts were within 1gr of target weight using lead bullet core machine scrap. Casts using the flat pins drop out easy since they tip out of the way. Very pleased!