Making iron castings is low tech, dirty work. I wouldmn't blame RCBS, I would blame the regulatory environment in this country for forcing manufacturers to outsource some of their processes to countries with no environmental laws.
They do it to save money! There's several foundries around here that would be HAPPY to make those for RCBS!!! My nephue runs a foundry, and it's a real problem "every day" trying to compete with 3rd world countries on price!
DM