Mine will chamber .452 cast bullets in SWC, LFN, and WLN shapes but not WFN. You can use your WFN bullets for light to medium loads by seating them a little deeper and crimping forward of the crimp groove (use a lighter crimp for this). This is NOT recommended for full power loads. Or you can size them smaller so they will chamber normally. I don't know how small. I stopped using WFN in my FA 454.